Hextech Crafting is just a under-the-rug brive to get you to buy more RP
When it was first released, sure great. Get a chest here and a key there. But now, 50-60 games later and so many S's included, not a single key fragment. Oh sure, you still get chests, but in order to open those chests, you have to keys which are practically non-existent. But Wait! You can get keys by buying RP! Yea, good idea to lure us in there Riot.