The analysis is complicated by the Home Theater market. Many non audiophiles purchase expensive systems for their home because they can financially. They want loud movies, not listening sessions. Without doing any research I look only to my own family. My non audiophile brother spent a tone on money on a dedicated home theater. At least 20 grand was spent and that is non trivial. He was not ripped off, he had nice gear.
Sales wise that would be viewed as an audiophile purchase, when in fact it was not. I have quite a nice system that would probably cost 30K to replace today, yet I quit the gear chasing merry go round a good while ago.
Parsing out the data of true audiophiles, which I would categorize as individuals who have listening sessions and understand the market as well as their own preferences in gear, is quite difficult to accomplish. We are all guessing and using our own metrics trying to answer this question.
There are many levels of financial capability to acquire increasing levels of gear as the top end has become insanely expensive. A young person starting out in adulthood in their early 20s typically does not have the means to acquire top end gear, yet the few that are audiophiles have the desire to build their system as best they can. Tracking that demographic is almost impossible.
I would suggest that population of what I deem as audiophiles is rather small as much of the really expensive gear is most likely purchased by individuals who buy six figure cars and are neither car enthusiasts or audiophiles. I would like to be wrong as I love this hobby and great sound, but I believe we are just a very small niche that does not drive the market.