Even if they represent only about 12% of the champ roster, ADC occupies about 27% of skin releases..
This, based on this year's release up to the new announced Arcade/Battle boss skins. Also, with the soon to be 9th prestige skin coming, ADCs occupies 3/9 of the prestige skins, AKA 33%.
Even if you are an ADC main, you can't deny that those numbers are insanely high for a champion class that occupies the minority of the game, often stealing the attention from champions who actually deserves it (You know, like a certain mage
?). Skin releases need way more variety, and it should start by stopping the ADC favoritism.