Yes, you are right : Commodore USA had gold in their hand, and sold only about 5 millions Amiga...
That was a big failure for me, compared to the quality of the machine, about 5 years ahead of all the other computers on the market...
So? So maybe the Amiga was the greatest thing ever and it failed. Happens all the time. Without Commodore, the Amiga might have failed a lot faster. Or it might have just been chips in an Atari crap computer. Or maybe just a bunch of patents no one cares about.
But according to your logic, Jay Miner should have given the design away for free. That would have been the noble thing to do. And then we would have had 10 Amiga users alltogether instead.