Cause are skins ... Not game content.
It woul be a waaaaay healtier game if they would stop releasing new contents and will start releasing skins for payer user.
Skins won't make you win a game
Skins won't rise you faster
Skins won't cause imbalance
( at least here, in other games skin provvide bonus stats ... and that's a true joke )
If ppl pay for having access to such cobtent i have no prob .... Always better than having whales roaming around with 5* Manicure full geared at day 1