Riven Skins

Why doesn't Riven get more skins? Sure I know a lot of people hate on Riven cause they say shes OP but there are so many other champs that are more OP and are actually used more often. Not many Riven players out there to be honest but when someone does pick her they start complaining. So many other champs get a lot of skins and seasonal ones too. Riven deserves more skins and I'm sure people would buy them, and if they're not gonna make more skins then atleast let the other few skins like championship or Dragonblade be purchasable. And don't give me the you can get dragonblade by buying team fire bundle because no one should have to spend $100 is they really only want one skin. Be fair Riot! You have Riven players that want skins too.