It's almost like it's just cosmetic, which is what selling skin is for, which is also something every single developer does.
Which would you rather, devs selling cosmetic stuff, and devs literally selling power like say for example World of Tanks.
I'd rather Riot just keep the selling aspect to the cosmetic things.
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Also I mean, Riot puts more effort into their skin development means they are putting in effort so that you won't just pay 10 dollars for an altered model but also some extra voice lines? How is that an indication of what you're trying to say?
You will just twist it however you want in the end of the day. If today Riot doesn't have extra voice lines in the skin you probably would put up a thread criticising that Riot is not putting in enough effort and is just selling remodels for quick bucks as a "skin seller". Funny that.