They'd make more money, that's for sure.
Completely aside from the fact that little boys are probably not going to want to do this, it's beyond me why parents would WANT their kids (note: not boys specifically, not a gender thing) to do this. My parents, mother especially, loves Disney, has always encouraged me and my sister to dress up, loves princesses.. would *NOT* pay that much to put goop in the hair and etc. She thinks the Boutique is adorable, amazing, but is just too practical. How many other parents are like this? If they won't spring for girls, they definitely won't want to turn their boys into princes.