What if Riot sold Skins from over 5 (or so) years ago for the IP amount value as well? But with restrictions

All skins being sold for IP must be under the 520 RP mark. Skins that are rare 520 RP will not be included.

They will cost around 1350 to 3150 each. Somewhere in between.

Reasons

There are over 250 skins now. That including rare and average skins.

Each skin costs $4 dollars (at least). That's at least a good $1,000 dollars in revenue for little cost to Riot.

Also, people will still use RP to buy skins. Considering the same goes for the Champion themselves.

Why not more expensive?

You already got the champion, you shouldn't spend the rest of your life trying to get 1 skin that costs $4 bucks by RP standards. Though getting 1350 IP isn't much either, even 3150 IP will not satisfy the old players with their large quantities. I think.

These are old skins Riot. Skins you yourself said you do not plan to update in the future. Skins that are outdated by newer, flashier ones that do more.

I honestly like quality more than quantity, but these skins don't get the quality they need until a champion update or such. Just a brush over on its lighting or color.

I would ask to the same about the Chromas, but those themselves should be a reward to the player... meaning that they should be available when a player reaches level 5 on Champion Mastery. These Chromas should cost the player to buy, though (to get rid of excess IP or to even spend RP for your pleasure Rito) they should stay in the 1350 to 3150 area.