You're forgetting that some people might have a large enough community within a small area and therefore hold meets more often, like metro areas here in Asia (although admittedly there are times when I suspect that hype drives impressions), and the meets being relatively convenient to set-up, we go through several tracks at least without necessarily rushing the entire time.
If anything, the problem with that system is altogether different: if you're like the sixth person to seriously try them out that day, that means the headphone could have been worn for at least 45mins x 5 people, so the earpads could be too compressed. I've noticed people listening for shorter periods towards the end of the day, but whether this is the primary factor I can't tell (some might be prepping to leave, some might be hanging out with the other smokers, etc).