If what you want to do is an incest game, you'll write it with the expectation that players will play it with the incest patch.
Okay, and what about the people who support you ?
By default they'll not have access to the incest patch, and therefore will support you for a story that make no sense. Because it's how it works, you do not release the incest patch before the game is leaked, else it's easy to link you to it ; the community can't make a patch for a game that the community haven't played yet.
And what about all those who will get your game from SVScomics or one of the so many sites that also offer pirated games, but don't cares about patches ?
They'll not even know that an incest patch exist. All they'll see is a story that make no sense, and there's no chance that they'll decide to support you one day.
In the end, you'll make a game with for sole and unique target the F95zone community. Okay, it's the biggest community in the adult gaming scene, but it's still a small fraction of the adult games players.
But that's a shit ton of extra writing so that people can play your game in a way you don't intend it to be played.
Who the fuck has time and motivation for that?
Anyone who is serious enough, care enough about his story, and care enough about the people who will want to play his game.
It's your game, something that you are making because you want to share a story and an experience with the public. It's your creation, your baby, something that you're expected to care for, that you are supposed to present in the best light. It's a showcase for yourself, the practical representation of your personality and capabilities.
Why one would want for all this to just be "good enough" and to only make sense under very particular condition that just a minority will effectively meet ?
Oh, of course, it imply more works.
But you are ready for this in order to offer the best experience to the player and not make yourself looks like a cheap and lazy guy, right ? You want to make the best game possible accordingly to your capabilities, not just make something "good enough because fuck I'm tired of this shit", right ?
Therefore you are also ready to do this extra works. Ready to follow the constraint you imposed to yourself by voluntarily choosing Patreon to fund an incest game.
And if you are not ready for this, then why should we, the players, expect that you'll care more for the constancy of your story, the quality of your writing and CGs, and the small details that make the difference between an average and cheap game and a quality one ?
The story is the most important part of the game. If one isn't ready to goes at its maximum to present it in a good light, then you can be sure at 100% that he'll don't make more effort for all the rest.
In a time where there's around 500 new games started each year, and more than 3,500 games currently in progress, who want to loose his time with a game made by someone who's not ready to some efforts ? There's enough choice to fill your free time with quality content, no need to waste it with something that is, right from the starts, advertised as totally cheap and that will be full of inconstancy even when played as intended.