Let it be fixed at 10 legendary shards which is their initial cost.
With the cores not being the endgame of armor masterworking anymore, it doesn't make any sense to have this restriction, not even the new ones at banshee have this ridiculous price increase.
Also, banshee could start selling them as well, just for practicality, since he already sells the other 2.
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Who can possibly have problems with lack of cores right now every time I look at my inventory it seems like I have 10 or so laying In there and I've masterworked every weapon I even remotely use.