CAPTCHAs are over (in ticketing)

Sell at the economic equilibrium price (determined by auction) and whoever actually enters the venue receives the difference between the auction price and the desired price by the organizer in cash or maybe in form of a coupon for their next concert.

That results in unbounded offers.

Sounds like an interesting situation! But I do see the flaw in my proposal now. It will select for the top-n richest customers, which kind of undermines the point of selling at a fixed price.