So, let me get this straight about the unique auction:
You pay to bid.
You can make any number of bids in any increment up to the max listed.
If your bid is the most unique, you pay the amount of your bid, plus shipping, for the item.
So, if they allow 700,000 bids to take place, at $5.00 each, unique auction makes $3.5M on the item and everyone who paid to play, gets didley?
Not a good deal in my mind. If I wanted to play the lottery, I'd buy a 649 ticket.