I really don't think so, I mean you spend upwards of 40 grand on speakers and then sell them for 40% less than you paid weeks or months later?
Are you assuming folks are paying list prices? I know a few guys who rotate gear regularly. They buy new, and get dealer accommodations, generally 30-50% off list prices for electronics/speakers.
Maybe these are folks that just like to hear stuff in their home, and know some industry insiders. They get bored quickly, and want to try something else.
I think there is a small amount of people who go through a hell of a lot of gear.