10-15%!? Even coinbase with it's high fees is %3 + $0.50 round trip, which is pretty much equivalent to paypal. I would also think a crypto solution would probably take barely anything in management fees, unlike kickstarter and patreon. If your smart about it, you can use limit orders on something like GDAX and make it %0-%0.5.

Despite all of that, I don't think you need crypto for this. Patreon dropping people out of distaste is giving money to competitors who don't care. What would stop that is credit card companies refusing processing to these companies.