I don't have anything to sell, if you want to roll the dice on aftermarket earcups, knock yourself out :)

But you paid 300-400$ for headphones, to me it's worth paying the OEM premium just to make sure they keep delivering the quality and experience I was looking for initially when I paid the high price. Otherwise, you might as well buy the lowest priced noise canceling headphones: you'll get a commensurate experience but you won't break the bank.

Anyway, to each their own :)