I agree with Jazzguy, the concept would work if you were technically savvy enough to either tweak scripts or write you own, however you would have a pretty large hill to climb to compete with eBay, Craigslist and the like. Brand identity would be another huge hurdle that would require a lot of thought and work.

Thats the negative side, now... Go out there, work your tail off and create your dream site. Prove to yourself that it can be done.

__________________
GrafxStar
"Growth begins when we begin to accept our own weakness." - Jean Vanier