Well the accounts are on notepad and items are just images with an id number.. its all simple and compact.. the only way they catch people is through trades or report system.. which is probably just temporary data and probably have criteria to distinguish rulebreaks eg one who has 9 blackmarks might be more likely to break rules so they will be more suspicious around them say in goldfarmers case, player A B and C trade all the items they made that day to player D, Player D sells it, and then gives it away for free, suspicious? Doing that everyday its hardly a kind deed. as for whats said i doubt logs are kept, only if its reported :)