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.