Runes need end-game system

I love rune system. It was great when i was new and i tried to catch a proper runes for my build.

But as time flew, and i got stronger, i got SO MANY runes in stash i refuse to pick runes from the floor. That's just a waste.

I'd be glad to see a system where i combine 3 of same runes for like 5% chance of Tier2 rune, and 0.1% for Tier3 rune (or 3 tier2 runes with 5% for tier 3 rune?). It would give runes a new life in the end game, and would gave people a reason to pick them up (or sell).

Nerf current % of runes if nessesary to stop powercreep. Or just make higher tiers add more stuff (like 2% to attack speed additionaly or something)