It's not always about money or popularity. I will never have incest in my games, if I make any, no matter how popular or lucrative it is. But I digress. Without meaning to sound like I overvalue myself, is it better to have one silly ol' me who loves the game for everything it is or ten others who just want to boink a sister? Ideally, you want as much support as possible, but the latter will eventually move to other sisters, while some who would stay may miss out because they were misled by a tag they got tired of.
My point is that not every tag is necessarily good to have, particularly if it represents only a small portion of the game (while it usually represents big part of other games). But that's a problem of the whole system.
My other point is that I don't think it wise to put up incest tag until there actually is hard incest content, if it's not the game's focus.
Where is Huitieme's "everything" gif when you need it?
Thanks, Huity.