Just because someone hears a high-end audio system—marveling at how lifelike and far from what they listen to it is—rarely does it equate to them running down to the store and buying one.
It takes a special person to become inspired to the point of taking the leap that changes their life.
Is it one out of a thousand that hears a great stereo system and decides for themselves that this is worth their time?
I don't have any insight into the numbers.
What I do know is that it takes a very special person to care enough about the quality of their musical reproduction system to invest their energies into building one for themselves.
