It's not the idea of the sale that perplexes me.
It's the fact that after this, they will pull off the skins completely so you can't buy them anymore.
They are probably doing this because these skins are selling poorly, so they want to lure people in at least with a discount and the fact, that they won't be able to buy them anymore. Granted, 2 of these are just the complete recolors with nothing changed to earn them the price. But after finally getting a skin since his floppin release, Urgot will now have only two again.
And Kayle will have only 1 unique skin and that's "Ashe Kayle" how I like to call her, that a lot of people got for free.