As Split Ends Said bathory is good training for merchant classes (need santa poring weapon or hydra weapon imo, + 182 flee and 140 hit). The card sells for 4-7 mil imo, and the witch starsands sells for 2k+- each to other players.
Glastheim is good place to farm fabric to. Since creators will gladly buy it for 1k +.
If really desperate you can set up a npc item shops. Most notably flywings, butterfly wings, blue gemstone, awakes. Buy it with a merchant with max discount and vend with the price close to competition (see prontera banker) or npc price without discount.
And I made my first million on a alchemist mining. ( its the fastest zeny + no training + boring + and can have medical conditions )
