Most people play games to escape reality not be beat over the head by it. For an adult game, a lot of times that means a harem. Besides, there are plenty of real life examples of guys with enough money/status/good looks to maintain a harem. Do any of those girls give a F about him? Probably not, but both the guy and the girls know what they're getting out of it. The girls want money/status/lifestyle. The guy wants sex with lots of hot girls. Everyone wins.