What like 32020's were easy to find? - The currency HAS to be something that is very hard to find - otherwise its not valuable. It needs to be a single space type item too like a ring or small charm - so you can collect them without running out of inventory space. I think the currency on west used to be HEX's -i never had one. I think they all got wiped by the ruststorm. My Chars on east still have their 32020's though.

Low level Runes and Gems are too common to be practical as a currency form - you'd be trading Huge quantities of them for the better items. I can see it now "100 sol runes for your Enigma - via 2.5 easy payments of 40ea". People would take your first 2 payments of 40 and then just leave the game - no enigma for you.