I don't know why these deals always have to be so complicated...
I'm a member of some BMW forums and whenever we want to do a group buy, the company we are dealing with usually takes orders on their own.
PM him with that suggestion: that interested parties contact the seller/dealer himself and place an order. If there has to be a minimum order for a certain price, then the company waits until that minimum order is reached before charging the buyers.
There really is no reason for a private party to buy and hold the merchandise untll they "interested" parties come through (or don't). In this situation, it's not even feasable since someone would have to shell out over $10,000 and sit on a handful of niche skimmers (that no private party is going to be able to sell for retail price).