Hextech Crafting Question: What do *I* do with Blue Essence and Champion Shards?

(Note: This post was originally removed from Help and Support, but the notice suggested I move it here to Gameplay.)

Greetings,

I have a serious question about Hextech Crafting, but let me give you the background information first.

I own every champion and have more than 400 skins. (This was when I foolishly believed that Riot Games was "all about the players." Good one, Rito. You certainly got me with that one.) I also have more than enough IP to grab every new champ that comes out and play enough games to replenish that IP stock, so I never have to worry about missing a new champion when they're released.

Therefore, Hextech Crafting isn't necessarily going to benefit me that much, especially when it comes to champion shards and blue essence.

So... what do I do with all this blue essence and these champion shards I have no intention of using? Is there going to be a use for this stuff in the near future for those of us that don't really need it?

Also, why do I keep getting skin shards for content I already have? I don't remember the last skin I got from the system except for PROJECT: Fiora during that confusing as all hell event last month.

EDIT: I don't play Ranked, either, so getting levels Mastery levels 6 or 7 is not going to be an option.

EDIT 2: I get that I can play Normals, guys. I was under the impression that Mastery Levels were for "competitive environments," and figured that was Ranked.