we have three B&M's near me, The first one I have ever been into, was before doing research into places. I didn't know the difference between MODs, clones, clearomizers, drip tips, batteries, etc..
First place was ok selling some name brands, KangerTech, Sigelei and aspire. And trying to pass the rest off as authentic, using the authentic names and calling it that. Like an Evod Twist, Ego batteries for a lot of their starter set-ups.

. They also sold only their
juice. I didn't see one bottle of other juicemakers stuff anywhere.8-o
Then I found a more reputable place and this awesome forum.
I am getting a better understanding for things, especially for what not to buy and who not to let build or try to sell me something I really didn't want in to first place.
After some research, I found out how to tell if your getting the real deal.
Second place I visited had slightly higher priced things and I ask why. Their response was these are authentic models, store xyz sells clones. Also, second place was more helpful in answering my questions without sounding like they were searching for the answers. They also sell over 70 different juices from various makers.
Third place was in between. More of a starter type of store. Catering to those looking to give up analogs and not getting too much into the hobby of cloud chasing.
I have to say to Cullin, I may have been one of those people, like the customer you were talking about, that went in and was unaware of the dangers of battery safety. And sub ohming is one thing if common sense is used.
Almost everywhere I have seen online they warn you, NOT to go below 1 ohm. All APV's I have seen won't work if you go below 1.2 ohms.
So, knowing what I know about this I would have done the same thing.
I learned Ohm's law years ago, but have forgotten most of what I learned about electronics. So, until I am up to speed on the information needed, I am gonna just stick to my Nautilus and changing the
coils when needed. Builds will come later.