The reason Kincaid is not being payable, is because they still working on the game, and want it to be like that until its a finished product.
Its just a matter of perspective on what is best way to have the game as. Paid while being developed, or free until its complete, while having donations or subscribtions for supporting the game like Patreon, Subscribestar, and PixivFANBOX.
Viewing post in Cool concept, but can it stand as a paid-for game?
no actually, kinkaid is free because its free.
because having your porn game paid only completely alienates your community.
people who can/want to pay, will pay.
people who dont want to will keep coming back for each free update, increasing the games popularity.
as a paid game, most people wont even get the chance to try it and leave good reviews/tell friends.
the standard is, sex games are free (the full game) but you can pay to get the most recent update or support the developer.
there is no room for paid projects.
There are plenty of games (even sexual) that is free, but that goes the same for games that is not free.
You clearly have not seen many porn games being put a price tag on. But then again, there is plenty of websites that pirates other games and put them there as free, because none wanted to pay for a game.
But then again, you not here for a game, you here for a game that is free.