What's a good way to make mesos?

Train at mobs that might drop a good mastery book. Make monster crystals out of their etc drops, disassemble their equip drops for more monster crystals (unless they are 3-lined potential or otherwise exceptional stats). Bemoan the fact the book never drops, sell the monster crystals and whatever decent equips or scrolls drop... Not a way to get rich but it keeps me above water, potion-money-wise, and doesn't take time away from training.