Retro Skins Should be for sale?!?!?!?!

So with Riot doing all of these champion remodels, which are quite amazing imo, I think the older skin versions would make a cool purchase. As someone who takes pride in their illustrious skin collection (yes i'm a nerd) I think it would be an awesome idea and I know I would personally purchase some of the older cheeser skins.

Sion is the first one that comes to mind for me.

I guess my question is do you agree? And if so what skin would you be interested in getting? :D