It's not really that. Niche patrons pay more to get niche products. Supply and demand 101.
Furry patrons like animal like genitals and feral stuff.
Vore folk like vore most dragon lovers like that.
Monster lovers love well.... You get the point.
Animopron went full niche and gathered the niche supporters. Niche supporters will pay more to get said niche content.
Karne made his game first then added monster stuff BUT to get the niche even further he added feral monsters.
Wicked Island said no feral enemies BUT made beast like enemies that can do feral stuff.
And one on patreon I support 100% since day one is WildLife. It is human x anthro but the anthro are more animal than person. So for instance wolves have dog equipment and felines feline equipment. They filled a niche and still complied with patreon.
I was just showing you if you are willing to dip into taboo you can ask a bit more money for it and most that like that content will pay. That us why those niche substar users do so well.
Add a niche and advertise it then they will come.
F95 zone can show you that one first hand. All the games and devs I mentioned are on there if you want to see.