I don't think it's quite so straightforward from the end user's perspective -- if you get stuck with a counterfeit, even a functionally identical one, you're still missing valuable "features" that aren't part of the die, like a warranty. And that's assuming the counterfeit is made to the same tolerances, and won't prematurely fail because it was a reject that didn't meet QC and got siphoned off for resale.
