Hi ,
Personally i measure the value of a domain name based on 3 things
1. how many characters
2. easy to remember
3. appropriate for a site
If it has 3 characters it is really valuable , if it is easy to remember is again great as everybody will remember it (Google or Yahoo). If it is appropriate for a site , you cannot register HowAreYou.info for a Webmaster Forum
Thanks
Olgi