And what few B&N booksellers understand, from what I can tell from personal experience both as a bookseller and as a customer, is that they have the power to order one or two copies of something in that they know they'll handsell. It wouldn't go on reorder--when it sold it would have to be re-ordered--but I had the power to do that as a children's bookseller at B&N. I was constantly recommending Howl's Moving Castle and the Dalemark Quartet, neither of which were ever in stock where I worked, so I was able to order one so I could recommend it.
Not the best system ever, but there are workarounds for the motivated ones. Hence, the reason that Brandon's books are so popular at one particular store...