This isn't really the case, mate... Many creators never finish their games, abandon and start new , then abandon, and start new... etc.
Both Patreon and Subscribestar, were created to allow small game developers to create, and i'm not talking here about porn games.
It takes everything, music, writing, painting, dance, then it started to deviate, to adult content, because, why not?
And there lies the problem:
Because you are betting on horny geeks, to support lewd contents no matter what. It ain't only fans bro...
People pay for contents. And some earn quite a lot of money, so they don't mind that $5 here or $10 there, or even $20.
Pocket money... But, take 200 supporters with $10 each and it is $2000. Serious money for some poorer countries.
Look what happened to Dr Bones and his "Manssion"... How many updates this games had or even how many artwork he posted in the last 12 months? One...