Kickstarter recently relauched Drip as a Patreon-style backer platform. I was invited to be one of their first projects at launch, but declined once I saw their payment processing fees. The usual 8% but with 20c per transaction, which they said was Stripe's demand. By the way, I wanted to launch a yearly subscription thing, which I found out wasn't going to be possible in their framework (only monthly and per-post, just like Patreon). For what I wanted to do, which was based on microtransactions, I just couldn't agree to it.
Funnily enough, Patreon last week announced a change to their processing fees that was really similar to what Drip was at launch this November. Patreon users balked. Just an hour or two ago, the CEO sent out an email apologizing and announcing they weren't going to roll it out after all. They're sticking with monthly batch processing.