Makes sense, but then if you're interested (and invested) in a project monthly, you'd probably follow to another payment platform to continue. At least I would, especially one that doesn't limit authors. But then Sisterly Lust was one of my all-time favorite AVNs, so I might be a tad biased.
Wasn't aware, good info to have. I figured they were similar, knowing Paypal's raised their cut over the years on money transfers. Makes it a more difficult call, though as a donor I'd probably be willing to toss another 10-20% at an author if it meant less issues, and no limitations on content or presentation. Again, YMMV.