It can be a good way to make money, for sure... even the big game publishers sometimes sell their games before finishing them. Which is just really dumb when consumers pay for it, despite there being no benefit to doing so.
Sexual games being sold as 'early access' can really get people's money and attention, because people don't think clearly/rationally when sex is involved, especially when you can declare something as non-heterosexual, as it gets an abnormally high degree of forgiveness and virtue signalling for anything that isn't heterosexual, even if it's terrible or lacklustre.