Champion update refunds.
Now, I know Riot has already said that they wouldn't refund a player for a champ after they reworked him, but that is utter garbage. Be it for skins or for GUs.. In my personal experience: Veigars E being crippled has caused a plummet in Veigar players. People are pissed about the Fiora rework, not to mention GP's ugly ass.
If people owned these champs before they changed something, shouldn't Riot have a legal obligation to offer a refund? They charge people money for a product, then change it without any consent of the customer, which, fine is the danger of an online game, but then they REFUSE to allow people their money back? You could argue no other online game offers money back on patches, but in the case of a skin, something you have purchased with real money, that is then changed, or when a whole champ is changed from the ground up (Sion), it just seems shady as hell to keep a persons money.