I kid (mostly) but women just ARE expensive as a function of their existence. Even the "low maintenance" and "cool" girls are going to run up a tab with you.
I was talking to one of the teenage cousins and he burned through his entire summer haul already, all because he's trying to keep a cutie pie on his hook. She's great and all, but it's an arms race: Clean, classy white girls have a lot of bidders, and she' got better offers for her weekend than to hang out and "watch" you play the battlefield beta test with your dbag friends.