Try this mental exercise. Create a web-based role playing game that would be the absolute worst thing you could possibly imagine for girls to play.
Earn money? We can do worse. Let's make it so that the boyfriend has to give you the money every day.
I've never described a game as "evil," but after reading about Lady Popular from XS Software, I'm pretty comfortable with describing it that way - especially as the father of daughters. I'd rather my girls play a game that could give them nightmares than one day find them engrossed in this kind of shit online.
I'm not even going to link to it.
Finally A Game For Girls! Lady Popular [Rock, Paper, Shotgun]