At least I know, what I do. Blizzard just laugh, when some players say "I should pay 10x for killing this bore 10x more". Because it also can be 100x, 100x, 100500x, etc. That's, what is called Korean MMO.
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At the end every single game in this world is replayable. Even Tetris and 5-in-a-row. You just need motivation to replay them. But does it mean, they should charge $210/year?