In our weekly 9-ball calcuttas or our occasional bigger tournament calcuttas, the winning bidder generally is aware there are no guarantees of anything.
The purchased player may choose not to purchase half of themselves back and may choose to concede games or matches at any point, etc. Buyer beware - that’s just the chance someone takes when they choose to bid on and potentially purchase them.
For that reason, those players that have a reputation of having previously done that may often be purchased at what might seem to be a bargain price in relation to their skill level.