well, if you want to play safe, go to estibot, appraise the domain name, it must have great name that can be monetized, must have more than 1,000,000 google search results, must have more than 10,000 MSN freq, must have 1000+ wordtracker, must have 10,000+ overture, must have high ppc, and must have more than 100,000 USD estibot value lolz. and not only that, it must be .com, and if you do not understand the name in english, forget it(although it has 100,000 USD estibot value).~~:P
--end of joke--~~ or may be I am not joking ergh.
I think price depends on human themselves.
if it is not dependant on human, nobody will use it as a substitute to bartering.