My experience in rough terms/figures is:
Chinese glass : American quality glass
-- Function of Chinese is typically 75 to 90% of American. If you throw out the reject Chinese pieces which get sent but are really sub sub par /rejects
-- at a cost of from 1/5 to 1/10 of American glass.
I kind of used max of $500 or $600 for American glass as beyond that you mostly get artistic/cosmetic value.
So, like any product that last/top 10 to 20% of function costs a lot.
For me, my glass lust tops out at about Mobius level of $400ish.
I doubt I'd ever buy a $600+ piece