Well.. depends on the game, this is of course an obvious reason after all. And personally speaking, the possible range of games that I might buy is really, really restricted to just a couple of them (watching the titles here of course) - mostly because of my fetishes and what I like the most. Since I enjoy some good pregnancy and/or futanari stuff, the latter I believe that will not happen. Not now or never since there's no single game that manages to reach the "completed" finish line and plus, I really doubt that a futanari game can be easily released to the public. I mean, people are perverted sure but not enough for this.
For the other, honesly speaking? I would gladly spend something like 20€ or more for, example, Roundscape Adorevia if this ever gets released physically. Why not, even a collector's edition if anything since after all, the game is very well made and is greatly entertaining. And I would do the same even for a possible.. say, Strive For Power or similar.
I know that the main topic was mainly for daz3d/ren'py stuff kind of games, but personally speaking I didn't see any single one that was interesting in here. Not one. Maybe just Fate Of Irnia if anything, but other than that? Too many games with the same concept, same models, same situations and so on. So far I didn't see any originality at all.