A friend of mine in Final Fantasy XI cheated at one point in a way no one was ever going to find out. He bought some gil, because the economy in that game was honestly a mess (thanks in no small part to a concentrated effort by a small part of the Japanese playerbase), which meant that he could buy more stuff without as much tedious farming. But no one was really ever going to get him for it; the developers were more concerned with finding the people selling gil, not buying it, and the only people who knew were people who had not intent of selling him out.
They say, of course, that character is what you do in the dark. Flashy, obvious cheating is the sort of thing you can wind up getting banned for. But what if you could cheat in such a way that either no one would ever find out or you knew you would never face consequences for it? Would you cheat in an MMO if you could get away with it? Or would you still consider it just plain dirty pool?