Skin distrubution

Why do some champions have RIDICULOUS amounts of skins like for example - Katarina - compared to champions like - Urgot, Rengar - like Katarina has 11 skins total compared to urgots 4 total skins. That is a CRAZY difference, what I'm saying is that yeah not a lot of people play some champions and don't get much attention but I think it wouldn't hurt if every champ received attention no matter what or how many people play with that specific champion. Also in my personal opinion some skins need a rework for example - SSW Rengar, and Nighthunter Rengar - I'm not sure how Riot makes or does the skins or what is going on or why they do what they do but in my opinion I would like to see this small changes on some skins that make it look that much better. For the SSW Rengar skin, I feel like that doesn't fit his style or character, I am a Rengar main and in my opinion Rengar isn't just some Cat running around in a T - Shirt with a plastic Knife trying to kill everyone. I think it should be more like a hunter or menacing or threatening, and for the Nighthunter Rengar skin, he has no dreads or braids under his hood or when you have his hood off. I'm not sure if there is other skins but if there are two things on one champion that could've been better with a great company like league, there is clearly other champions with some needed tweaks. I know this isn't ground breaking stuff but I feel like if Riot wants to "sell" the skins they should add even the little things, and try to give an equal amount of attention to champions either by emotes, icons, skins, or even maybe wards would even be cool. Clearly this isn't something that is a priority.