the reason there are so many girl skins and almost no boy skins in eggy party could be that girls can spend a lot of money on clothing. 200 dollars is nothing when buying clothes, so the developers expect that girls wouldn't mind spending 200 dollars on a skin to stand out
but really it's a question if such strategy is good for them, because you never see anyone having supreme skins in game, yet everyone bought fluffy red fox skin. maybe if all skins were 5 dollars, they would sell more. chinese people should understand this well
