One potentially valuable tool that nobody's mentioned is statistical work. For instance, to take a simple example, if your in-game currency is gold, you can easily track how much gold is in the game, how much is produced daily and how much is consumed daily. A significant jump over your average daily production would tell you that you need to look for duping exploits or quest exploits or exploits in however players produce gold.
Can do the same thing with any resource in-game. For instance, we've found a few quest exploits by just ensuring we record all xp and gold gotten from doing quests and then looking for quests which are suddenly producing more xp and gold than they historically have.
Stats are your friend. You can't keep enough of them.
--matt
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