Most audio equipment store operators possess extensive experience, allowing them to smell it out real buyers through intuition or conversation. Given that HIFI audio stores typically have relatively few customers, they highly value every visitor and each potential sales opportunity.
In my point of view, its highly depends on the customers themselves. Most male customers have a very clear understanding of what they want basic on what they have at home and wallet. Its totally fine that you sit there enjoy the music even with snacks but if you keep asking to switch the speaker or audio source etc, we will began to think “you gonna buy or what”