The problem they are trying to solve is real. Many people don't know or want to know how to market things they don't want anymore. They just want to sell them. This is the same reason that Google now offers assistance with Adwords campaigns - many businesses don't want to have to become Internet marketing experts, but need customers.
I think that without a local presence where items are screened, fraud/product misrepresentation/stolen items will be a significant issue - perhaps enough to sink them. They are essentially saying "hey, use our eBay account to sell stuff and we'll send you money". They have serious logistical issues to deal with, but I wish them luck because they are solving a real problem with potentially massive rewards if they can get it right.