I have thought of it.
I haven't tried it because crowd funding platforms currently seem hostile to NSFW creators. OnlyFan just tried banning NSFW stuff(reversed for now) and Patreon have crackdowns of their own in the past.
The only protection against those platform shutting you down would be having a large fan base. I don't know if I will be able to build a large enough fan base on itch.io, but for now, I am willing to wait and see.
It is something I will continue to reevaluate.