as far as i know, enchanting only needs spirits for mats, and it's dirt cheap to buy those of the AH on most servers.
jewelcrafters only use those for untimered discoveries, and that's so random it's unreliable, and you need 3 spirits for 1 discovery, which is 9 lotuses, which is easily over 1.5K on most servers. you could also use them for ore to prospect, but again, it's cheaper to buy the ore and turn the spirits into lotuses.
so, should I even bother with farming spirits of harmony, either through tillers or mob grinding?