Well they are there for the people that really don't care and just want some quick cash.. It's just like if you were to take a new $60 game that you bought 3 days ago back to ebgames they would only offer like $20 for it, a third of what they'll turn around and sell it for.
Craiglist ftw though, friend sold his bronco in like a week and got all of what he was asking for. Plenty of people will be lookin for a small truck like that, post up that ad!