That's my biggest problem with Patreon. Not saying that this particular dev is like that, but it's a recipe to encourage "laziness". Artists aren't paid for their end product, they are paid for creating them, without real deadlines.
At the beginning, you bust your ass to give the best quality, the fastest possible. You create multiple routes, add new girls, it's fun. After that, the next updates take a month or 2 longer because you had some bad luck, but you realize you just made double the $ for taking more time than usual. I don't know many human being who wouldn't start making these extra months a regular things.
Just for exemple, if I understand Patreon correctly, someone like DrPinkCake have 13k patrons, he's making $28K - $89K per months (Idk if Grapheon is a reliable source?). Last real chapter of BaD (Episode 8) was a year ago. It means that Patrons have paid between 336k and 1million to date for Episode 9, and the release date isn't even published.
That's why I think that something like Kickstarter would be much more fitting. You calculate the time, effort, cost, etc.. of your next episode and ask for that, period. People can pledge over the limit, but when you have reach that number, you should be good to deliver. There would be no benefits for devs to push back a month VS Patreon where someone like DPC could (and I say COULD, not that he is doing it) easily push back a month or 2 before releasing and already finished product just so he can take a break. An extra 30 to 90k$ to take a break, without nobody knowing, is really enticing.