They are betting they will make much more money pressuring customers for extra profits vs the loss incurred from having Shy Ronnie not want to come to their store because it's irritating.
It ain't just "shy ronnie" who doesn't want to come in. It's people like my roommate who just tend to get pissed off if the salesperson doesn't get the idea he wants to be left alone and if he has a question, he'll ask it.
Yes, there are a lot of rubes who can easily be talked into something. There are also people who know what they want or are looking for who don't want the salesperson's "help" unless they have a question (and sometimes not even then).
You sure you have even taken one class of psychology? Ok, I guess I can believe that. I can't believe though that you've had much experience dealing with people with your small, small understanding of people and their motivations.
Maybe you're one of those salespeople who you pretty much have to tell, "**** off!" because they can't get that the only thing they are doing by refusing to take I'm not interested as an answer and don't realize they are doing their cause more harm than good.
Yes, there are times when you are better off leaving the customer alone. There are times when you are better off selling the product. It depends on the person and a good salesperson doesn't rely on either but relies on being able to tell who they are talking to.
You, apparently can't when you take one statement, and you can't even see the tone that it was made, and totally spin it into something else. All I read in that statement is that he doesn't like pushy salesmen. He said nothing about them scaring him or that he felt forced to buy anything, and yet you wanted to infer that.
So either you are socially inept at dealing with people since you only want to infer your own feelings on them, or you just want to argue your own argument and twisting people's words around to make your argument look better (I actually suspect the latter. I also am very suspicious about your claim of studying a lifetime of psychology).