I understand that he wants to get more money, I'll even say that with the quality of renders, the different paths and the story (though it has weaknesses), he SHOULD earn more than 300 bucks, but the problem is that:
1) Most people aren't rich enough to support all the projects that are worth their money.
There are so many good games out now, even if you have a bit of money to spend on a rather obscure hobby like western porn VNs, you can't give to all. So of course, though it's sad, not all games will get the support they deserve, while some relatively horrible games and even worse devs earn way too much.
2) The idea that he can go and release no update and just wait for his patreon to reach 2k a months is ridiculous, whether he charges the current patrons or not. I even doubt the game will attract a significant number of new patrons at all, after maybe an initial raise from people who like the game enough they would pay a few bucks to see it continue.
Not with so many games coming each month, not with so many games currently in production.
I'm not saying he doesn't deserve more money, but he won't get it that way, by what many will think is holding his own game hostage. Honestly it's a really, really stupid idea, I don't get how anyone could think this would work out.