Yes I know this isn't what you asked but this is still the best answer for max profit. Look at the "tree killer" guides, Sycanmortes drop 1-2 bill gold (the equivalent of 100-200 plat but you only earn this much in gold mode) per kill. I have been using sakura pegacorn fluff to farm area 5 sycamorte. I regular leveled it to about 20 and then used 30 ally plus potions gained from voting in the arenas for 8 days in a row (24 days total). The sakura mp price seems expensive but its 4 days of hitting the platinum cap in the forums and at level 50 you earn that much every 1-2 days from battles and thats just doing 100 battles per day.
Fafnir Scoop Add an accuracy amulet to the Ambitious, because it's hit rate is a bit spotty. Starlit has good, massive damage, too, but lacks the healing ability of the Ambitious. Fafnir splicing shards can be alchemized, or spend 500GC to buy them in game.