Patreon is over 5k every month.
Going on for many years. He easily made 150k bucks. Also 99.99% donations are from the western audience.
Why is he still prioritizing Japanese? Simple, he will also sell the game once it is done and earn another fortune.
Going by the degree of completion it will easily take another few years at the very minimum.
I think this is one of the first RPG Maker Hentai games that will earn over a million bucks.
Somewhere down the line I think people have lost their rationality and some developers like this guy are realizing that working on the game and trying to finish it is actually contrary to their own financial benefit.
Why finish a game when you can easily milk 60k from Patreon alone for doing minimum work? Wouldn't suprise me if they actually had additional jobs and other revenue sources.