Spending RP on runes

I think the idea of being able to spend 50 rp on runes would be a excellent way to get runes faster. I hate having to grind my ass off for runes that I need especially if their a tier 3 rune. I mean it's easy to do just wish I could have a faster alternative to get runes faster. I would be more then willing to spend money on rp for rune packs that have up to 20 runes or even just single runes that I need.