If there's nothing else to do (yeah, right- in retail, there's ALWAYS something that needs to be done), educating people isn't a bad thing and can make strokers into long-time customers- we used to spend the time teaching kids about audio and the owner would tell us to stop wasting time on them. I left in April of 1988 and many of those same 'time wasters' remained loyal customers until the store finally closed more than 25 years later. One of them is a good friend- he had worked across the hall at the mall and he still has a pair of speakers that he bought from me- he actually sold audio at two higher-end stores and was a rep for a firm that sold Revel and other name brands. He still likes those speakers and doesn't have any plans to sell them, more than 35 years later. I went to a party and met the wife of another kid who used to go to the store and she said he still had the whole system that he bought from me- that was over 30 years later, too.
Investing time in potential customers must be considered a benefit, not a waste!
You just never know when the kid you talk to today may be the best customer in a few years with a large bank roll, and he certainly won't forget the time you gave him when he was a broke kid.
Furthermore, the people in these particular niche industries (audio, biking, etc)
should be so passionate about their work that they actually like to discuss and educate, regardless of the $ at the end of the day.
I have personally been on the end of a salesman "profiling" me on more than 1 occasion, where he was clearly thinking to himself, "there is no way this chump can afford this stuff, he is wasting my time". Well, that a-hole lost a lot of $ and a lot of potential $ due to his preconceived world view.
I have also had the exact opposite experiences, and those are the ones that gain a customer for life, and possibly several thousand of my dollars.
One time I went into a bike shop, fairly early, just 1 other customer. I went in there to ask some questions and it was part of my info gathering looking for a new bike. The guy behind the counter was still drinking his morning coffee, and we had a long chat, he answered all my questions, and we started looking at some bikes and pricing at his dealer online connection (he did not have the style of bike in stock that I wanted). Other customers came and went, and the other shop guy handled that while we chatted.
Along the way of natural conversation, I discovered that this guy was actually the owner of the bike shop. At the end of about an hour of his time, I told him "get that bike on order, I like the vibe of this shop", furthermore, I ended up going for a step-up model.
So, I went in there just intending to talk, get some info, see what stock they had, and go about my day. I left with a deposit, a bike on the way, and an agreement to pay ~$1k for a new bike. Since then, I have paid that shop another ~$1k over the next few years.
That is a pretty dang good return on investment for an hour of chit chat.