1. Making a game that "makes everyone happy" is impossible, especially when it comes to sexual kinks.If I was this developer, I would do the following to make everyone happy:
ROUTE A - You're dominate over her, but you NEVER share her with anyone. (Harem minded)
ROUTE B - [Currently in the game.] You share her with the whole town and are dominate over her. (Netorase)
ROUTE C - She's your wife/girlfriend/fiancé. You help train her, but you never get to fuck her. Instead, like a masochist, you have to watch the whole town fuck her, and you get cucked REALLY HARD, to feel extreme emotional pain and anguish. (Cuck/Wimp/Loser)
You'd cater to a wide audience with basically a few hours of programming work, and then you're done.
If you want to throw away the Patreon $$$ you'd get from ROUTE A & ROUTE C, in addition to ROUTE B, because you hate money, then stick with Route B only so you generate less Patreon revenue.
Making a pure Netorase game isn't profitable IMO, you have to offer the Harem & Cuckold path as well, in addition to the Netorase, then it's complete. The Harem & Cuckold path should only take a few hours to program in. It should be easy.
2. Even if dev included all those routes it would take much more than "few hours of programming". It would require new gameplay mechanics and tons of new art and dialogue.
3. Why would route B not be profitable? If the content is good there will be plenty of support. If every dev only catered to this forum's degenerates then we would only get harem, pregnancy and incest...