Seeing as you asked the general audience and not a specific demographic i'll put in my opinion nobody cares about.
I don't care about the theme of a game whether it's cuck, NTR or what have you, i'm just there to see hot women fuck. I don't care who they are fucking unless it's a Yuri romance game in which case NTR/cuck isn't a thing so it's never a problem.
I wouldn't support a male MC game because I generally don't enjoy male MC games unless that game is exceptional. I'm talking Depraved Awakening, Where the Heart is, Twists of My Life, Wicked Choices or Offcuts level of exceptional where the story and characters all grip me and keep me reading.
It's not that i'm fussy it's that I just can't get into the right mind set playing the opposite gender and cock isn't exactly on the top of my fave list.
I have played through NTR games like Tyrant purely because some of the scenes are pretty hot. Seeing a woman getting fucked unconscious in a toilet then get creampied by her son was hot. I don't like incest but watching someone getting fucked like that does please me. Same for the basement scenes with the 2 women in the stocks things.
NTR like that doesn't bother me because, as I said, i'm not the MC. Wrong gender and i'm just there to watch the sex.
While I have supported male MC games they do need to be ones I really enjoy for story and characters. Generally my money goes towards RPG's though, I enjoy them more.
TL;DR i'll play it but it's not something i'm all that interested in so probably wouldn't pay. Plus i'm a pirate, asking me for money is silly.