Why does Cary Audio keep discontinuing good amps?

It's a marketing tactic called 'planned obsolescence'

people become smarter as they run out of money.

Why do car companies keep discontinuing good cars?

I understand planned obsolescence, but look at companies like Audio Research. They keep improving on good designs with MkI, II, II, etc. This makes more sense.

I wonder if some of Cary's designs are not so good, or they didn't sell well, while the better ones stay around a little longer until Dennis Had gets restless. Anyway it is frustrating to know which were good and which were mediocre.

Upgrading doesn't satisfy everyone either, check out some of the ARC threads. There are a great deal of ARC owners that are miffed because ARC continues to upgrade their designs more than other companies. Let's face it, technology is changing very rapidly and companies need revenue to survive, just the way it is! I am okay with it as long as they continue to service the obsolete component.