If the players use their association to muscle in on tournaments and decide that they want to have an independent or impartial monitor of the prize funds before, during and after the tournament that would prevent anyone from running off with the cash like the entry fees from the USPPA event, and that would be a way for someone to determine if payments can be made in full preventing the IPT delayed situation.
Essentially the pro players association can sanction tournaments giving them sponsorship in exchange for management of the prize money. Just because they manage the prize money doesn't mean someone won't run off with it but there are barriers that can be put in place. Since the prize funds are managed by a neutral party nobody can rob Peter to pay Paul.