Do not buy arrows from players, since they take more money than they are worth. A arrow can be bought for 1 meso each in the store or made by obtaining 1 possessed wood (10 tree branches/5 firewood and 1 stiff feather.) Do not use upgraded arrows (Bronze arrows) for training.

Magician

Ice Lightning Mage:

An Ice Lightning mage with their cold beam at level 15 will find fire boars a valuable source of money. At that level, you should be able to kill fire boars in one hit. Ice/Lightning mages should try not to use Lightning Bolt to train at early levels as the MP cost is very high.

Cleric:

Clerics level 43+ with maxed heal should utilize the monkey forest or monkey swamp. Zombie lupins give good drops, exp, and you can mob them up and heal attack them. They drop nice amounts of meso too, and cursed dolls can sell for a nice profit. Zombie lupins are sort of like an upgraded fireboar but for Clerics. In actual fact, Clerics should NOT be losing Maple Story mesos.

When dealing with Area of Effect moves like explosion or thunderbolt, you will save a lot of mesos by sniping mobs instead of jumping into them and attacking. The main advantages of AoEs Maple Story mesos are their ability to assail monsters, yet giving the mobs no chance of reaching the caster.

Inflation