Why are most High End Amps class A

Hello, new here and wondering.

I've recently been looking and reading at Audiogon and see that most "High End Amps" are class A. Currently I own a McIntosh C28 preamp and MC2105 amp. To me they sound fabulous.

Would a "High End" class A sound any better?

Of course I realize that there are very expensive class A's that would blow away my Mac's, but what about say a used class A in the $ 1000.00 to $2000.00 price range?

Thank you so much for your input!