The sad truth is, us hardcore fans (fiercely and passionately debating in FSD, DOAWorld, DOAFR...) are just a minority of DOA gamers. The big majority are casual players and are also in it for the fan service. They'll applaud every new bikini, fetish wear or beach gravure scene coming their way. They don't care, if the characters/game looses any trace of dignity in the meantime. They don't care for the series...but they might come back for DOA6...maybe.
And let's all be honest, many of us bought bikini and fetish outfits in the past too, right? Combined probably more of these, than outfits for the guys.