I'm sure this has been mentioned many times.
Allow us to convert the lower lvl MKs into the next version. I myself currently have over 1,000 of each.
Maybe 10 Mk 1s = 1 Mk 2
10 Mk 2 = 1 Mk3
That would be a reasonable exchange rate
Or allow us to sell excess gear/mats into shard shop currency
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