Bids: What did you bid for your ticket? Tips?

RE: Web sites that allow one to ‘bid’ (offer a price) for a ticket.
Some say they have minimum bids.
Terms can be confusing (regular fare, discount, lowest bid allowed etc).
Re: carriers 'filing chapter what ever." The web
has good practical advice for travelers e.g. carriers filing
chapter what ever / with questionalable finances may not
provide speedy refunds etc.
Tips appreciated on good travel agents, buying tickets on line etc.