I vote TMO before the class system and Rogean laying down the law. Probably then Rampage at its formation through the first few months of Velious.
TMO definitely denied more loot over the long term though. Epics selling for upwards of a million platinum, and everyone just went along with the idea of not being able to obtain epics or having to farm about a million platinum. Rampage never set a precedent like that.
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