Yes, you're right. This is my first game as a developer. I got confused with the tags and already understand how important they are. I won't make the game 50/50 with NTR or without it. Right now, I've created a ticket to figure out which tag exactly suits the game.
I might be Biased here because I prefer no NTR/Sharing of any kind (girl on girl is okay)
But yeah i think games without NTR/Sharing and such I think make more money for the developers assuming the games got decent writing and characters and looks good and such and harem games even more so.
Here is my reasoning for that.
As someone myself who doesn't like NTR, Sharing, cuckolding, swinging or any girl that you can or will fuck eventually ever being seen with other men, doesn't matter if she was a LI at the time or not.
Anyway the reason is because those who enjoy NTR and sharing and similar tags... They likely can enjoy most other games that have no NTR. I'm not a fan of Anal in games but It doesn't bother me, I just select Pussy if that's an option but if not oh well anal sex here we go..
But someone who dislikes something NTR and sharing... Well it's not a simple kink like Anal... NTR in my opinion is less of a Link and more like a lifestyle choice or a crucial trait in your life because your either for or against it. NTR in a game can make or break a romance or characters and opinions and such... A Love interest asking you for anal or another Kink that doesn't involve other penises isn't really bad. It's stuff we can look past but NTR effects NTR haters more emotionally I think because we are more inclined to develop feelings for said characters. I don't mean that in a weird way but we begin to like them and someone who loves NTR probably doesn't give to shit for the characters as a whole and just want to watch a nasty gangbang, the nasty the better I imagine is their opinion.
So I am not expert or statistic keeper or anything but I think there are more males in the earth playing porn games who rather have a harem instead of sharing any girls but those who enjoy sharing girls which is likely a smaller population of players can and will likely enjoy your game without NTR...
TLDR
NTR = only NTR lover play
No NTR = both NTT lovers/haters play
Admittedly there are some players who won't even play if NTR is 100% optional and can be avoided.
For an example likes say Landlady if about to be Raped and sexually assaulted by some creep in an alley at night, normally you have the option to run towards the situation and best up the creep or you can sit there jerking it off watching landlady get sexually abused... Some say it's rape so it's not NTR but most NTR haters call a rape situation in game NTR anyway because it gives us the same negative emotions or feelings as regularly girls cheating willingly or if the MC gives permission for sex acts NTR haters still see it as NTR.
Anyway to the point even if it's fully optional like that where there are 2 paths with 2 different scenarios playing out some may still not play but those players I think are an even smaller number than NTR lovers so you will still get a lot of players playing if there are 1 or 2 optional NTR scenes in the game so long as they are fully optional and the optional to saying yes or now has different scenes play out... We NTR haters really like to see some obvious shit like you and girlfriend walking away from the optional NTR male... We really hate screens that fade to black and pretend like we're drunk and don't remember anything. Don't leave any ambiguities