I also have limited experience with B&M, but it didn't take me long to be able to "size up" a shop, usually within 5 seconds after walking thru the door (though I do keep an open mind because you can't always judge a book by its cover.
The most annoying to me (this type I have only heard about from several sources, never been yet) is the
1) Frat boy shop: "Brah, if you ain't vaping below 0.25ohms, you ain't a real vaper. PAAARRRRTTTYYYY!!!!!! CLOUDS ONLY!!!!!!!! WHOOOOOOO HIT THIS BEER FUNNEL ....!!!!!" Usually, they either know how to roll low res coils but know nothing about safety, or they roll a crazy low res coil for a customer who knows nothing about safety. I don't condemn clouds. I sub-ohm myself. But the core vaping community is "find the vape that YOU are comfortable with." Not like this type, who are "party-....-vape or you are just a n00b." Esp facepalm-worthy when they take this attitude with a veteran.
2) Head/smoke-shop shop: "We sell everything else you can inhale, so we stock e-cigs, too. We have a limited selection of gear we have almost no knowledge about, and we stock awesome flavors like tobacco, apple and menthol from a vendor you probably never heard of. The juice we sell comes in low, med and high nic strength." 'Nuff said.
3) Bandwagon/fad shop: The owner of this place knows more about retail than vaping. Which I don't condemn. The owner may/may not have hired people with sufficient knowledge about vaping. However, that doesn't matter because they know, will talk to you about and seek to make a sale only about product they have in stock. You may/may not be able to sample the juice they carry. They usually carry low-to-mid range juice (in terms of quality of flavor). they MIGHT even carry a few gourmet-tier flavors. It's a storefront trying primarily to cash in on the "vaping fad". I don't condemn this, either. I have even bought from places like this, but it is what it is.
4) The Vaper's Vape Shop*: Yes, all business is about making money, but these people decided to make money doing something that they love. There is vast knowledge there, either because of the hours spent in research or the hours spent talking to and exchanging information with customers/fellow vapers. They will carry entry-level as well as advanced gear, and they don't mind referring you somewhere else if they think a product they don't carry might better suit you. They may carry simple flavors, but most of their selection is multi-layered gourmet juices. And they are so happy to showcase the flavors they carry that they don't mind abandoning the sample tanks and pulling out a bottle for dripping, should someone with a dripper walk in, saying, "here, try this flavor in your dripper, because some of the background notes in this juice get lost in tanks and carts."
They also want their shops to be the equivalent of a bar for vapers. Half of their real estate is dedicated to a sitting area, because they WANT loitering vapers. They are happy even if you are just there to hang out, take some toots and talk vaping. They understand the community, because they are part of the community. They support you finding your own vaping path and help you to get there with any information they can share. It's like a B&M version of ECF.
I know I haven't really commented on the "price" issue, yet. But, after being in a number 4, after the dude spent 2 hours just letting hang out, talking to me and letting me "sample" his stock the whole time (basically vaping the store's juice the WHOLE time for free asking nothing non-stop), i went ahead and bought some juice, batteries and my charger from him, knowing I could have gotten it cheaper online.
Anyways, in my experience, B&Ms usually fall into 1 of those 4 categories, or maybe somewhere in-between on rare occasions.
*I didn't realize there was a vape shop called this. I didn't mean to refer to this entity in particular. 'i have never been there, so I cannot say what kind it is. I simply meant for #4 to refer to vape shops that are run by true vapers themselves.