The Kraken:
I guess my problem is that I have a hard time entertaining the hypothesis that a person who works at a dive shop has a level of experience with every type of equipment that the LDS sells,in every diving environment that the piece of equipment may be used, that would enable him/her to make an expert recommendation or condemnation of that piece of equipment.
I think the flaw in the concept is that the person working at the LDS is "assumed" to be an expert.
I can actually relate to the dive shop employee. For over a year, I worked as a salesman in EMS, selling highly technical gear to people who really use the stuff. I'd spend most of my day making recommendations on vertical ice axes, technical backpacks, backcountry skis, touring kayaks, climbing hardware, etc. Of course I only had limited experience with the vast majority of the gear we sold (though I had extensive experience with at least one or two items in almost every category), but I would never let the customer know that. You have to know how to talk the talk and feign a certain level of exerience in order to make an effective sale... and, unless what the customer *really* needs can *not* be met with a product in your store, you sell them what you have on hand.
That's how it is being a salesman for technical, often life-support gear.
That's also why I never get "advice" from a SALESman. It's his job to SELL you things, not give you impartial advice. I get my gear recommendations from experienced mountaineers, cavers, kayakers, and skiers, NOT from a dude trying to sell me something, no matter how experienced he is.
This is doubly so for dive shops, where selection is normally limited and the salesperson is even more likely to have very limited experience with gear.
If the salesperson is even a diver, it's just one more diver's opinion.. and a highly biased one at that. I'd never buy anything at all on the recommendation of one person anyway.
Insisting that there is a problem when the person swiping your credit card isn't a diver is as silly as it gets.. it's their job to sell me the gear I want, not talk me into the gear they have.