Activities like FATEs, dungeons, raids, and select (soloable) quests should yield currency toward gear and crafting materials specific to their level range with an option convert them higher or lower at varied ratios.
I dont know why but this just really grinds my gears. I hate it when MMOS use multiple currencies instead of keeping it at drops. I know how it does make a more fair system but it doesn't make much sense and ruins the immersion/game a bit. Its because people wont be seeking that powerful item instead they want "FATE coins", they wont be hunting for powerful gear, they're collecting marks for gear from a shop, and to add it all up, all DAT currency D:
Edited, Jun 26th 2013 3:51am by Panduhnan
It keeps people playing the content instead of doing it once and never looking at it again though.