The dropdate for the following TLDs is not verified. Domains might drop earlier or later: .eu .cat .aero .travel .tel .jobs .ae .at .be .bg .cr .es .fm .gd .gg .gi .gl .gs .gy .hn .ht .hu .id .im .ir .is .je .ke .kg .ky .kz .la .lu .lv .ma .mu .ng .no .om .pe .pf .pm .qa .re .ro .ru .rw .sb .sm .sn .so .st .su .sx .tc .tf .th .tl .to .ug .uy .uz .wf .yt .berlin
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.
The second option requires a bit more time and effort than a 301 redirect. You could do a mini overhaul of the site and turn it into a microsite for your main domain. This option is good for exact-match domains for your targeted keyword, and there are other reasons for going the microsite route that Rand's highlighted in his post about root domains, subdomains, subfolders and microsites. This strategy also works better if the old domain has decent rankings for the keywords you're targeting.
Yes! Selling domain is an emerging trade and no wonder if it can develop into an exchange. www.DomainX.org has been initiated with this view. There are some good ideas in the comments regarding which names to buy and how to grow their value. However one must not forget that it also involves a recurring cost (annual renewal) and keeping many of them might become difficult if you are not really selling at least a few to cover it. Enjoy free listing at DomainX.org.
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”.