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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Why make currencies useless? Do you need another glimmer? another legendary shard? I already have 900 cores... why should I be able to buy in bulk for basically no cost? Can you for once just let a currency have value and do the work required to get it?