^^I do this with my GC seals, both of my retainers are constantly out on quick ventures, and while, most of the time, stuff they bring me is mediocre, they sometimes bring me back stuff that easily sells for 100k+ or is from 1.0.
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I have a much better idea, how about they unlock those GC extra ranks for us to earn as well as new equips/items instead. Then you'll have plenty to spend seals on.