But say, with a game like Path of Exile and it's crazy, crazy skill trees, half the fun lies in finding the really overpowered builds. The dev's have even been known to show the best ones on youtube - they don't do it anymore, but are still very welcoming of users exploiting the mechanics in creatiive ways to get an upper hand.
On the other hand, something like World of Warcraft could be horrifically imbalanced in a number of ways, and it was hardly ever fun for everyone all at the same time when in a PvP scenario.
I just resubscribed for the year following a 8 day hiatus and have a $15 coupon here for whoever uses it first. Living in the UK makes it prohibitively expensive, especially for a T-Shirt that nobody will get.