What % of winnings reasonable for "backing" someone?

[theben]

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1 thought, this isn't backing.

this is a [censored] loan, with horrible interest (provided he wins). just what a "friend in need" needs...

backing = you provide him funds, if he loses it's on you, if not, you get a share of profits. this is NOT backing, must be a great friend.

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I totally concur. Backers assume 100% of the default risk and just take a higher cut of the winnings. This is NOT backing in any traditional sense. This is actually a horrible deal for your "friend". I truly would be embarrassed to offer a friend this arrangement.