It seems like it would be trivial for them to reduce quality control and have customers just "deal with" chips that aren't as stable. How come they aren't doing this?
I remember when Intel made Pentium CPU's that had a small math error in some very specific floating point calculations. They were so afraid to damage their reputation (which was still excellent at the time) that they offered every Pentium owner across the globe (including me) a free new Pentium CPU without the bug, shipped to us at their expense, and even sending out a courier to pick up the old CPU (again for free) a few weeks later when we had time to swap them. That was basically the opposite of what you're suggesting.