What % of major tourney players are backed by sheets/bax?

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In most deals, the tourney buyins (accruing over time) are paid back first ("makeup") before splitting the winnings.

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i don't really know much about these deals, so this might be a dumb question, but what's to stop a player from getting a new backer and skipping out on the "makeup"? do they sign contracts saying they're responsible for it?

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Wasn't this the source of some Scott Fischman/Thunder Keller beef or something a while back?