On the other hand, Patreon bills supporters as one lump sum and then pays out as a lump sum as well - that should at least offset the flat per-transaction fee, if there is any.
Sell "Patreon Tokens". 100 for $100 at a one to one exchange rate. You can then spend in stores (one time redemptions) or subscribe to creators.
Which is a problem but their proposed solutions always seem to involve things like "now everyone pays on the anniversary of when they started supporting a creator" which just completely fucks up the original value proposition of "we merge lots of little transactions into one decent-sized one", as well as fucking things up for people like me who are just using Patreon as a tip jar for stuff they release publicly. Letting individual creators decide this will work for them and opt into it is never mentioned as an option, so Patreon gets to hear a loud, sustained scream from creators who are normally quiet, and walk it back a week later.