Use an Experimental Auction Model to Sell Products Online
It might result in much higher income.
Offer your product with an exceptionally big and attractive bonus in an open auction (everyone sees all the bids.) The starting price is $1, and each increment is also $1. The auction ends when there is only one bidder left. That person gets the product with the special bonus. Everyone else gets it for the amount of their last bid but without the bonus.