How come Riot doesn't change a skin when a large amount of players ask for it?

I've actually been wondering this for a quite some time, but only decided to make a post about it now. I bought Dreadnova Gangplank and a lot of people (including myself) think his Q sounds like a pee-shooter, it kind of turns me off of the skin and i just go Special Forces or Minuteman. A lot of people are complaining about the Victorious Graves skin, and are pretty disappointed in it, the same with Lancer Blitzcrank's walk animation. My question simply is, wouldn't fixing stuff like this on skins increase sales? Wouldn't that give Riot more profit and make the players more happy? I know i'm probably never going to get the Q on Dreadnova Gangplank changed, but is there a good reason behind them not upgrading skins a little bit to satisfy more players and sell more skins? It just seems a little dumb to me.