LOL, good of you to stick with a vision. Though that means you'll probably lose like >90% of the male players and perhaps pick up some of the much rarer female ones. You can already pick out some of those making vitriol comments on the main page now.
But don't let that get into you, ultimately there are also developers (for e.g. ebi-hime) who stick with strict monogamy while maintaining commercial viability and pursue something they envision at the same time.
Just know that your story and character development has to be doubly strong as players who would play through a one LI with no casual sex game all the way tend to have very high standards on the writing with less emphasis on graphics.