[knowitall]

A handy way to sell things twice if boys and girls need different colors. Maybe not so much for dolls, but certainly for clothes (can't pass on clothes from older sibling if gender differs).

Perhaps the main desire being served is to be able to announce "I am a boy" or "I am a girl".

Also note that there aren't many pink first person shooters.

[kaybe]

The camouflage performance of pink in a realistic setting could play a role; you'd have to have a very pink world.. hm. (Unreal Tournament maybe? In my mind it was kinda purple..)

[knowitall]

Pink world wouldn't be a problem I think. Many FPS seem to play in weirdly colored fantasy worlds.