While buying up a ton of domains seems like a great way to make some extra money, the real world results show that it is very hard to make that process profitable. As with any industry, you will have those "golden moments" when someone you read about made it into a million dollar a year business, all while sitting in the comfort of his own home. That could be true, but he probably consumed a lot of alcohol and lost a lot of hair doing it.
If you are looking to sell a domain name that is no longer of use to you, a possibility would be to lease it through a third-party company such as Godaddy, which lists tens of thousands of names. If the name is a quality one, there are also premium agents such as MediaOptions, which deals with more selective domain names. An alternative option would be to lease it out on platforms such as Nameforest.com. Doing so will save you the time of having to find potential buyers, and will guarantee a higher success rate than attempting to look for a purchaser on your own.
When a domain name that was previously registered expires, it goes through a grace period that allows the previous registrant one last chance to reclaim their domain before it becomes available to new buyers. If the previous registrant still has not renewed their domain after the 77 day deletion process, the domain name will officially expire and enter the Aftermarket.
I've seen some people comment about losing the link value of domains that have expired and picked up, but what about non-expired domains?  Let's say a competitor is going out of business and they still have a year or two left, and we buy their domain and site.  Is there a risk changing registrant info and registrars, even if I keep their site up and mostly the same as before?  I was under the impression that I'd want to keep it under their name so as not to hit the uber-reset button on the domain's inbound link value.
Good point. Is the amount of work that went into getting a successful sale worth a $400 profit? Keep in mind, this is providing speculative numbers for the sake of debate. The real world hours invested in gaining position or page rank, and time a agency would sit on a domain before a sale would be much higher. We interviewed a few agencies that practiced this, not only those that supported our theory.
Now it’s time to transfer the domain name. Every site has its own process. Generally, the domain-selling sites require sellers to submit the authorisation code, which will initiate the transfer process. Once the transfer is completed, the seller can transfer funds from the escrow account to his personal account. Do check for the minimum number of days the amount must stay in the escrow account before the transaction can be completed.

What is a domain? Despite this word being mentioned so frequently, it’s often unclear what the functions and structures of domains are. Knowing the hierarchical structure of the Domain Name System (DNS) is fundamental for anyone working in IT or in any online industry. We explain the difference between top-level, second-level, and third-level domains, and how you can benefit from subdomains that...
When done right, the domain trade is an enterprise that lends itself to particularly lucrative deals. The tactic is simple: domain names are purchased with the prospect of reselling them for a wide profit margin. But the trick of this trade lies in securing domains that may later be valuable to well-endowed buyers, such as a large company. We have laid out all the important facts and terms on the topic, including some of the highest sale prices on record for a publicly traded .com domain.
When you backorder the domain it will say how long you have to place your bid in. Let’s say it says 25 days. If the domain is from one of Namejet’s partners then the auction will start in 2-3 days. If this is an expiring domain and Namejet has to catch it there is a chance they won’t catch it in which case it won’t go to auction at Namejet. If they do catch it then 2-3 days before the auction starts.

There are many places and ways you can purchase domain names.  You can purchase unregistered ones through sites like GoDaddy.  There are forums where people will gladly try to sell you their domain name (usually though the domains being sold in forums are either crap or the asking price is so high it does not allow you any room to flip the domain).  And then there is my favorite way of obtaining domain names, through an online auction at Namejet.  Let’s first talk about Namejet and then we’ll talk about how I personally ring the register by flipping domains.
Unfortunately, you probably won't like my tips. You need to look for quality domains at a good price and be willing to hold on to them to get your money back or know when you've invested wrong and get rid of them. Quality is in the eye of the holder, and believe me, I've looked at plenty of domain portfolios that the owner just knew were million dollar domains but in my opinion, they'd be hard pressed to get anyone to take them off their hands for just the registration costs. You have to figure that most of the best .com domains were registered in the 90's, and those are the ones you typically see the 6-7+ figure sale prices on. I'm not saying there isn't money to be made because there is. But it does take time, research and money, and maybe in some cases a little bit of luck. If you're thinking of getting into the industry, I recommend digging into the resources provided by Michael Cyger on http://domainsherpa.com and from there, moving to some of the other big blogs such as TheDomains.com or
Apart from pending delete and auction domains, you can use our domains crawler that lets you scrape websites in bulk to find domains that are available to be registered and have amazing backlinks. Your personal crawlers run on our servers and are entirely web based. You do not need to install any software or have a VPS or proxies in order to do use them.
Here's a test I have in process.  I bought an old $5 closeout domain from Godaddy TDname expired auction.  I put a quick minisite up and linked to it with a crazy anchor text phrase.  The domain is ranking for that crazy term now.  It's gone through one pagerank update and I'm waiting for a second to come.  Then I'll redirect the domain to another minisite.  I suspect the second site won't rank for the anhor text, but we'll see.  
Each of the third parties we integrate with charge for getting metrics for a domain. DomCop pays for their API to get this data for you and therefore you do not need to purchase additional accounts to get these metrics. One DomCop account will do it all. As new players enter the market, we integrate with them so that you always have the best and most comprehensive set of metrics to help you decide which domain to buy.
Flipping domains are similar to flipping houses in real estate: You buy a property with potential, improve it, and then sell quickly for twice the profit (or more). Between 2005 and 2012, internet marketers had been obsessed with flipping domains… and for good reason. Many were successful at buying plain old domain names, spicing them up with keyword-stuffed content, giving them much-needed traffic, and then selling them off to the highest bidder. But in 2017, can this still be a viable online business?

Be careful! When searching for domains, it might be tempting to, for instance, buy mcdonalds.net (if it were available) and then try to sell it to McDonald's. The logic here would be that they own the .com and wouldn’t want anyone to own the .net and use their name, right? Also, it’s a big name so there’s gotta be a biiiiiiig payday comin’, RIGHT? Wrong, and wrong.