They could make a kiosk/vending machine in the social spaces that dispenses any shader you have collected at the cost of some glimmer. Maybe like 2000 glimmer? Using real world currency to buy back something you have already found in game is big slap to the face.
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200 glimmer to buy duplicates isn't a bad idea. Not 2000 though
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That would be better yeah. Looking at the route they took with shaders, it could be a good middle ground. Then again it was already fine so why fix something that aint broke?