If you buy keyword specific domains, you're really buying the type in traffic.  I use the URL builder and redirect through that URL so you can see how much traffic your getting from the keyword domain.  There seems to be no rythme or reason to what keyword domains deliver traffic and what don't.  By tracking traffic with the Google URL builder you get a feel for what names are giving you traffic and which are not. ie. the plural, the singular, two words, three words, the possessive, etc.
Do you want to learn how to make money buying and flipping domain names? If so, this guide will provide you with the basic knowledge and direction required to get started! Unlike domain name investing, where a "buy and hold" strategy is the standard technique, domain name flipping is all about finding valuable domains and quickly selling them for a profit.
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

In theory, you could technically acquire a domain for $10,000 and be able to sell it for $100,000. You could also acquire a domain for $10 and be able to sell it for $100,000, $10,000… or $100, you get the picture. Because of this, it’s hard to recommend a perfect starting budget because your strategy, experience, and the pace at which you learn will hugely affect your buying and selling decisions.