No where do you even mention the fact that Bright Engrams are earned regularly through just playing the game. You would have actual traction for your concerns if Bright Engrams could be acquired [i]only[/i] from the cash-shop and not for free through game-play.
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No where in your rebuttle do you mention that tgey throttle XP making it increasingly difficult to earn bright engrams in game and thus encourage the sale of Bright engrams over earning them.