Of course it is not the only reason. But I think part of it is that owning McIntosh equipment may just be too simple for enthusiasts. Most, not all, enthusiasts want to try different equipment, agonize over their cables, find synergestic components, etc - in other words, most, not all, want to play and have fun with the equipment side of the hobby. I think McIntosh equipment appeals to those who want great sound, a good value, ultra-reliable, minimum "syngery" games, and the enjoy the equipment for the next 20 years. These are not necessarily the goals or drives of enthusiasts. Speaking for myself, I like some alchemy, some worry, some tweaking, some pondering - I think McIntosh is for those for whom this element of the hobby is not a priority. You will hear enthusiasts say they have found their last amp, their last pre-amp, etc. it never happens, it can't hasppen to an enthusiast, but it does appear to happen to happy owners of Mac.
Why do no audio enthusiasts use McIntosh?
With the exception of some of there tube gear, not many really use this stuff(or admit to it anyway), I am mainly referring to there amps. They look pleasant, they look good on paper and have the price of high end gear, but I seldom hear anyone claiming to like or one day dreaming of owning McIntosh. I have never really listened to there stuff, no good word of mouth sort of scares me away from it, the only people who like it are those who sell it, an uncanny coincidence? I don’t know. Sorry it this has been covered many times in the past, I ran a search and could not find anything.