What % of winnings reasonable for "backing" someone?

[theben]

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Its really not about the money. I would happily pay the $600 debt for him. Its really about teaching him to use his money (in particular, his poker BR), more appropriately. The reason he lost the $600 in the first place was playing in games he was way under-bankrolled for.

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I didn't know his 600$ debt was gambling related. That does change things somewhat. It's not like the debt was a car or rent payment, but presumably something much more irresponsible. hopefully, he'll learn from that