I'm a simple guy really, so after all the hard journeys, monster slaying, and all that good hero stuff... let the hero settle down with the girls he's won over living happily ever after in obscurity. What's the point of only choosing one girl with so many lovelies around and going through all the trouble of winning them over! Nah, it's a harem or bust dammit! I worked for that shit so let me shamelessly indulge in having the dream come true!!!!
He gets the girls, saves the day, and nobody needs to bug the guy about how awesome he is. Oh, and one big wholesome harem hug/kiss followed by.... a well earned harem orgy!. Maybe tack on some epilogues while we're at it, if we have time.
See? Nice n simple!