When I first started online, I'd register domains that I thought I could develop and sell at a later time. After learning my way around the cloud, I realized many of the domains I'd registered are pretty much useless, or so I thought, and I let them expire. Come to find out several of these domains have been picked up by parking sites and are being offered for sale for thousands of dollars! Now I'm not saying they're actually selling for the asking price, but I learned my lesson. I never allow a domain name to expire. I add content to it, backlinks, some AdSense and try to sell it for something.
There comes a time in the life of every domain when its ownership must transfer hands. The reasons for selling a domain can vary greatly; maybe the company is no longer being in business, or the domain was bought in bulk and never used. If you're looking to offload your extra domains to make some spare cash, or if you're sitting on a premium domain name worth a goldmine, see Step 1 below to learn how to sell it.
Domain names expire when someone decides to stop renewing it. They may not be available to register immediately. We update the search index every night, so some names may already be renewed or re-registered. Some may become available in a few days. Some registrars, like GoDaddy, will let you buy a name that one of their own customers expire immediately. When you find a name you like, just click on it to try backordering the name!
Many non-savvy internet users may not even be aware of the existence of other extensions. That said, because there are many new extensions popping up every now and then, you can often find amazing one word and 3-letter domain names with these new extensions that are otherwise almost impossible to find unregistered in the .com world. Additionally, these new extensions are becoming more and more familiar to users every day, hence it's almost certain that their value will continue to increase as time passes and wider adoption manifests. 
Expired domains are especially attractive due to key SEO factors that are primarily associated with an existing backlink profile. If you are considering buying an expired domain, you can determine the quality of it by looking at the inbound links. When it comes to assessing the value of an expired domain relevant keywords contained in the second-level domain, a possible reference to products, brands, or services are all useful.

So how do you develop that instinct? NameBio maintains a database of over 500,000 historical domain sales (as of writing this post). They have interesting filtering features by which you can narrow down domains by price range, date sold, keywords and more. Simply sifting through the listings on NameBio long enough will quickly develop your domain appraisal “instinct”.

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