I believe DS only stopped BB because of their annoying audience who were crying that they didn't want NTR. I bet he wanted to do something else with NTR, of Max being able to remove Eric from the house and another opponent emerge, but unfortunately there is an annoying audience that just keeps crying like a kid in PORN GAME! But there must be other reasons to have abandoned. Recently for those who follow the Glamour game, he scripted Eric's possible return to the game, and then during those months he opened a poll asking whether his audience wanted Eric to return or not, almost 80% of the voters said no.
DarkSilver is another developer who is creating his game based on his audience, as well as many others we have around here. His "New Big Brother" started off script different from his old game, and yet he was thinking of including Eric right after Max had already started corrupting the girls of the house? Anyway, unfortunately there are a lot of games that would work if there was NTR, I mean, the story and plot would be a lot more interesting, but it turns out that many users don't like NTR and not even that word be mentioned, and then, you no longer have creativity or imagination to continue the story, you have to keep milking or completing it.