I deal with the public every day in my job and it involves sales so I have to be extra nice, even if the person in front of me is a bozo. And that is the be all and end all of it.
If you are in sales, you HAVE to be nice to people. The thing you quickly learn is that if you ARE nice to people, they are usually a lot more pleasant back.
Plus it does not matter how much the last person you dealt with rubbed you the wrong way, you cannot be mean to the next person you meet. Otherwise instead of one no sale, you just got two!
This does not just apply to coin shops of course but it is a lesson some of them should learn. The strange thing is, in coin shops especially, it is not just the gruff owners but the way they eye you suspiciously which I find strange.
I think it may be that a lot of coin shop owners get into it because they love coins and not because they love retail and dealing with the public. Or because they particularly thought it would be a good business venture.
What I mean is that if someone wanted to open a shop (not a coin shop, they just wanted any shop) They would look at what was needed in their area and open one of those. Be it selling underwear, or doing dry cleaning. These people are shop owners. No one sits in a small town and thinks "We really need a coin shop"
Coin shops are mostly opened by coin collectors who want to make a living out of their hobby. And as we all know as a collector yourself the last thing you really want to do is sell any of your collection. Especially to strangers who wander in to your house (I mean shop!). Maybe that's the mentality?
Just a theory!