Obviously you couldn't bid with bound credits or escrow, but I would love to see this become a thing. Run it similarly to lotteries, but allow it to be set for crowns, credits, or gold. Have the highest bid be put into a different escrow so that the bidder can't accidentally spend it before the auction closes.
I also think it could help further stabilize(lower the price of) the credit market.
Dibs on being the first with an Auctioneer certificate.