For Tesla, the upgrade to go from 60 to 75 started at $9k, they dropped it to $7,500, and finally down to $2,000 when they discontinued the 60 and started selling the 75 at the same price as the outgoing 60.
So it's not really a $9,000 upgrade, anymore. It was a great
PR move on Tesla's part, and whoever bought a 60 should have known that the battery was software limited, so no one should really complain.