@Riot more context on the New crafting for skins?

"You can use the crafting table to reroll 3 of any permanent or rental item into a different permanent item of the same type (skin or champion)."

So you can trade in 3 skins for 1 of the same value?

http://na.leagueoflegends.com/en/site/2016-season-update/champion-mastery.html