The marketplace does need to be expanded/improved a lot. The potential for trade in used equipment is HUGE. Could be much bigger than new card sales in the coming months and create a lot of additional demand for GPUC. Think Ebay, minus the fee rape.
This would also keep GPUC denominated sales active even during down market times when miners are selling used equipment instead of new cards.
Well I'm definitely willing to work to improve it. The current setup has some unique ability (validations / escrows / seller ratings etc.) which I hope will get people interested / provide better security. I used dogemarket a fair amount and got scammed a few times.
The escrow system (
http://www.gpucoinescrow.com) is linked to the market (though you can use it stand-alone without any account) to prevent scams...but not all types...you always have to be careful.