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Half of the money made by in mobile games comes from about 0.15% of the player population (from a study in 2014, not sure what it is now). I'm not sure if that's the justification, but the pro playerbase is much more likely to be part of the whale group than the normal userbase
lets do math. there are at best 500 players in the whole world for who its relevant to grind multiple servers. 500x $500 for purchasing the expansion every 4 months ( im being generous here ) = $250k per quarter. Like I said “lunch money” These whales u talking about are not us
That being said Im not in a position to know why it is how it is :p