That\'s simple.
Instead of just tracking their liquid assets (cash), track total assets. If they\'re wearing armor worth 600, a weapon worth 1000, and have 200 tria, you know something suspicious is happening if they suddenly gain 100,000 tria or a weapon worth 100,000 tria.
On the other hand if they have a 8,000 weapon and 5,000 armor, they sell a rare, 4,000 object for 10,000 it\'s not nearly so much of a change.
In another case, though, an intelligent cheater would just cheat small amounts of money or small gains over a longer period of time; maybe idling for several hours, then cheat to make his stats seem as though he had been leveling the whole time.
So, in order to prevent some cheating:
-Track the total wealth (items, equipment, etc) of characters rather than just cash
-Track stats