Audiophile record sales of new pressing seem to be doing pretty well. I would say that anyone that buys an audiophile record when a "regular" pressing is available is an audiophile. I don't want to start an argument with the digital only folks, but that is a good start.
They have no problem selling 20-30,000 of $100+ records of very popular albums. Maybe one in 50 audiophiles buys them (this is global). Add on the digital audiophiles and you're probably at a couple million people worldwide. Higher percentages of the population are in they group in England, Europe and Asia.
If you widen the group to include anyone who buys $1500 speakers, you've gone too far because you've included HT people, many who have no idea what 2 channel auto sounds like.