GREAT reply Sublime

... I'm pressed at the moment from making a more in-depth post, and will later p.m. To start, I think there are several things that one can do to
improve their response / success rate, IMHO.
1.) FIRST ... Find the MOST relevant potential End users!!

2.) Call and get the EXACT NAME of the person who will be making the eventual decision.
3.) EMAIL that person a PERSONALIZED letter about your domain's availability.
4.) SHOW them how they and their company / image can be
enhanced with the domain.
5.) Provide STATISTICS (for instance, the Overture "Bid Tool" for keyword type domains).
6.) Be HUMAN ... "same old same old" Form/Script Email's are fine for sending out lots of inquiries, but in my experience, those unique,
personalized proposals work best, IMHO.
6.) EMBRACE failure (that's not a typo

) ... just realize it happens, and once you become fearful of failing (as is bound to happen from time-to-time), the numbers will no longer be in your favor! Rather, LET the numbers work for you by staying in the game (recognize that sales will be few and far between for the most part), and NEVER stop contacting relevant End users.
7.) Be cool, be professional, and HAVE FUN selling 'em domains , folks!
All the best!
