IMO, I would suggest they have a rotating system. Here is maybe : 10 mods or whatever for a month. Go buy them from Ada 1 anytime within that month. Next month another 10 or whatever the number is.
Another idea just sell a yearly package in the eververse for silver and or brightdust.
English
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xRealmAAAAHHHHH MY ELBOW (AND MY KNEE) - old
or do what they did with the year 1 shaders and sell it for glimmer