Let's try to bring this back on topic.
Fair enough
You are right though. I can't look at the price tag to decide if the price is right before I go forward because that price clearly doesn't mean anything at some shops unless I am willing to blindly pay it. So why get mad if some moron customer comes in and tries on a wet suit they have no intention of buying? Who cares. Do your best to make a friend and some money because even if that one "waste of time" as you said doesn't buy anything, they may give you good feedback at the dive site. Every bit of positive energy you pay forward likely will come back to you. Now, if your shop still closes then that really sucks but we all know that the best way to make a million in scuba is to start with two million.
Trying a wetsuit and not buying it is one thing but trying it just so he can order the appropriate size on the internet is low.