Comment by ryanatallah

It seems very likely that the change was motivated by payment processor fees. Patreon uses Stripe to process payments, which charges a flat rate of 2.9% + $0.30 per successful charge. Compare that to the proposed fee patron fee structure of 2.9% + $0.35 — where presumably the extra $0.05 per transaction is the cut Patreon takes off the top for themselves.