Tipping organizer of pick em pool?

I am in a pick em pool where everyone picks four NFL games a week against the point spread. One guy organizes and manages it every year. I’ve done it for years however never won so didn’t need to worry about how much to tip. I’ve seen 10% floated around the internet. The first place payout is over $6k… should I really be kicking back $600+?? If that’s the standard then fine but just looking for clarification. Don’t want to give it all away if I don’t have to. Thanks!

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