Crafters dont want to be nickel and dimed to death by buying a single Amalil for 750 Maple Story mesos, but they also dont want to have to dump 300 thousand on a stack of a hundred. Palatable stacks of ten to twenty strike that happy balance and result in consistent profits. Green manastones usually sell for a tidy profit, particularly those with pluses to criticals or attacks. Since they dont drop as often as regular manastones, obtaining them can be time-consuming, unless you avail yourself of the manastone quests available from all of the manastone-remover NPCs found throughout Atreias cities and townships.
Many players avoid these quests due to the paltry XP and cheap mesos payouts, but each quest turn-in gives you a shot at a green manastone reward. Given the fact that common manastones are the only thing required to complete the quests, all you need do is buy the required stones, normally dirt cheap on the broker, and then complete the quest. Spending a couple hundred maple story gold on the chance to get a green manastone that you can I ammediately sell for 50 thousand is a no-brainer, but surprisingly few people do it.