Market board botting is a problem

[Kes13a]

You can either focus on subsets of the market that are most profitable and gate (Neo-ishgardian rings cost ~30k to make right now on Crystal). Or you can move to markets such as: leve items, primal weapons (good choice if you can farm ex), Lv70-79 items (which can sometimes be worth more than endgame). Things that move too fast can't be controlled by market board bots: slithersand, sublimes are good options as long as you put it at a low enough price. Materias are good too though the exploit was removed recently.

Btw: when I say cost I'm including the opportunity cost. The total cost is material cost + opportunity cost. Given that rings cost around 30k, and that they move the fastest, you can make a good chunk of gil by focusing on that one market instead of all accessories. On Aesthete gear, the opportunity cost is so high that Aesthete's head, hand, and boots are the most profitable items given that people price them at the same level as body and bottoms even though they cost 20% less to produce. Accessories are too low and so even if they're 40% cheaper to produce they don't give the same returns as head, hand, boots.

While your theory is good, it falls down when the bots control the market. On my server, the bots have a listing in every item from about 40 to 80. And by every listing I mean.. EVERY LISTING. When the first bot I noticed was starting out, I only saw them in some of the neo-ishgardian gear. Now I have noticed they have the entire range from 40 to 80 covered.