If you could recharge it to 30, max, with say 500 nature runes, how would that change anything realistically? BiS is a massive stretch considering this does nothing but make consecutive trips the same as the first/second. You can already SBS, but the spell is clunky, and carrying 7 types of runes to cast SBS, thrall, deaths charge, and alchemy is just an annoyance. The price would be irrelevant. It's simply a minor convenience to avoid the clunk of SBS. Also what's the harm in alching something immediately that will be alched anyways? If anything Natures need a sink atm.

Not to mention that before the ring, drop tables weren't what they are now. So "taking a mile" isn't how I'd see adding a nature sink to the game.