The OP is a terrible idea. The game already has too much busy work (most quests and missions seem to boil down to "walk all over the map for no apparent reason, then come back to me" rather than having anything interesting in terms of game play). Don't you feel like it's enough busy work just to grind out the levels to begin with? "Hey, guys, now that we're done grinding on these mobs for several hours, lets go grind our craft jobs so we can craft our spells, or farm some mobs with an incredibly low drop rate for even longer than we've been grinding xp in order to get our spells." Ridiculous. Anything an MMO can do to NOT feel like a second job, the better. Just say no.