Listen to expert domainers on domainsherpa.com. Read anything by Michael Berkens, Frank Schilling, Eliot Silver, Morgan Linton, and Ron Jackson. Watch YouTube videos on domain investing. Read blogs like The Industry News Magazine at DNJournal.com. Search #domains on Twitter. Go to industry conferences. Understand the Google Keyword Planner tool inside and out.
it can be profitable,i'm selling domains and i can tell you that all providers loose money selling domains,we compesate it with  hosting plans but if you look just domain selling where providers buying domain for 7$-10$ and selling it for 0.99$-5$ ...well like say we compesate this with web hosting plans and other services,also on when some one renew domain but since even renewal is done mostly using cupons...than giving free domain with web hosting is best solutions.Well like i say it can be profitable if you want work with domain,buying domains for 0.99$ and than work with it and you can earn nice money.
Joe Styler serves as product manager for the aftermarket at GoDaddy. He’s responsible for marketplace products including any purchase, sale, or monetization of a domain name. During his nine-year tenure at GoDaddy Joe has served in a variety of directorial and supervisory roles. His passion is seeing his customers become successful in their business goals when using the aftermarket. He has been interested helping people with transactions on the Internet for more than 20 years. Joe received his B.A. from Moody Bible Institute in Chicago, and his Masters in Divinity from Gordon Conwell in Massachusetts.
Very good article and overview explanation. However I would not recommend buying names with bitcoin, ripple, etc in them. Not only will it be oversaturated those names are brands and can / will be trademarked and you can still be hit with a UDRP. Only register generic names like buycrypto.com, buyingcryptocurrency.com, theblockchain.com, etc. There are tons of opportunities and no need to infringe on a brand name.
You can’t tell us (with a straight face) that aged dictionary word .net and .org domains won’t sell easily. The .net extension is technically OLDER than .com, and holds an equally intrinsic value to that of its .com counterpart. These LLLL .com’s that are just letters slapped together may be cute to look at and easy to sell, but in the eyes of Google, ANY aged domain that makes sense (i.e. a dictionary word) is going to be much easier to rank for than some acronym or hodgepodge .com…and at the end of the day, that holds more value than whatever society sees in these nonsensical “wqij.com” names.

.ac .ae .ag .ar .at .au .be .bg .br .by .bz .ca .cc .ch .ci .cl .cn .co .cr .cx .cz .de .dk .do .ee .es .fi .fm .fr .gd .gg .gi .gl .gs .gy .hk .hn .hr .ht .hu .id .ie .il .im .in .io .ir .is .it .je .jp .ke .kg .kr .ky .kz .la .lc .li .lt .lu .lv .ly .ma .md .me .mn .mu .mx .nl .ng .no .nu .nz .om .pe .pf .pl .pm .pt .pw .qa .re .ro .rs .ru .rw .sb .sc .se .sg .sh .si .sm .sn .so .st .su .sx .tc .tf .th .tl .tn .to .tr .tv .tw .ua .ug .uk .us .uy .uz .vc .wf .yt .za
Prospective buyers can contact domain holders directly in cases where the desired domain is no longer available. Most registries openly publish the names and contact data of domain holders. Once this information is gained, buyers can get in touch with domain holders and make them an offer for the name. Sales are also known to occur even when the original domain owner may necessarily have never had any prior commercial ambitions
So the keyword planner came up with 332 keywords related to ripple, most of which can be used to inspire a domain registration related to ripple. Let’s go ahead and get some more ideas. We already know that ripple is another cryptocurrency. Let’s head to NameBio and explore crypto-related domain sales. We’ll use bitcoin for this experiment. I’ll type in “bitcoin” in NameBio search, select “show all” and then sort by price by clicking on the price column. Here’s what it looks like:
Most popular auctions with expiring domains are at godaddy, namejet, snapnames. Search for expired domains name its very easy if you have domains list. With a bit luck, you can drop good one with PR5 cheaper like $200, just need to know which domain have not fake pr. List of domains are not free, but updated dailly with aprox. 50.000 new expiring domain names.

A suspiciously high number of backlinks from some related niche websites that aren’t too great in quality. In my opinion, this could be an indicator that the domain name was using a Private Blog Network (PBN) service or their own PBN to boost their authority…this blackhat tactic can work, but it places your domain name at risk and the PBN owner could pull backlinks at any time.
Buying a website is a risky job especially if the investment is big. My first experience was a big fail. So after some time spent on Flippa I found out about a site called Safe Site Buying which I heard that was created by super sellers from flippa and got a coupon code "flippa50" which was supposed to give me a huge 50% discount. This deal looked pretty good to me so I tried it. They provided me with a full report, 20 pages long and with their own subjective opinion. They were very helpful. When you want to spend more than $2-3000 on a website this service is a must if you ask me.
As mentioned earlier, knowing the potential value of a domain name is an invaluable skill. By adhering to basic guidelines such as those I listed above and through some of your own research, you’ll be able to pick names that offer you a higher chance of flipping them more easily. Remember, a net profit of $100 is still a profit, you must start somewhere.
Determine your domain's value. Before you start taking offers or listing your domain, take stock of its value so that you can come up with a good price. There are a lot factors to take into consideration when determining the value of a domain, so if you are unsure it may be wise to contact a company that performs these assessments. Some of the major factors include:

HIM: "Mainly small-medium sized local businesses looking for a way to increase their ranking. Most already have a branded domain in place, and have heard that using a keyword domain can help. Or they have seen a competitor ranking using that method. The problem I face is that they don't have a lot of money to spend, so I get lowballed on the asking price. There have been a few that make a ton of profit vs what I purchased it for, but that boils down to luck: what is for sale, when I find it, things like that."

Where do I start? So I heard about bitcoin and I know it’s all the craze nowadays. Let’s start from there. I’ll hop on Google Trends and type in “bitcoin”. Google Trends basically tracks the popularity of search queries over time, it’s often a goldmine for discovering currently exploding or soon-to-explode topics/terms..etc. So here’s what it looks like:
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