Anyone else has stopped increasing Mastery levels on champions (6/7) ?

Is it just me or the mechanic upgrading Mastery doesn't feel right to you too? It never felt right to me, though I have stopped upgrading Mastery levels 2 years now. I have 9 lvl 7 and 13 lvl 6. I don't play much lately but my inventory is filling up with lvl 6/7 tokens. I don't think it is right to spend essence in order to upgrade Mastery at all. And at these prices it is "prohibited"! I would consider it if prices were 1/10 of what they are now. But still it wouldn't feel right.
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