Speaking as a former big-box book store merchandiser, I'm calling BS on some of this.
If BAM operates anything like B&N or other big-box book stores, the merchandising team doesn't pay much attention to the obscure little corner of the dungeon where they've stuck the "game books" (I noticed videogame strategy guides crammed in there too...yeah, those shelves are not seeing a lot of turnover). It's all about the front of the store, the endcaps, the big displays, the things that corporate sends special signs for.
Hold onto your hat: this was one aisle up from the front of the store. The front row? Manga. They aren't hiding this stuff in the back anymore.
As a former bookseller, I can assure you that many times the book that is going to end up with that coveted cover facing out shelving is entirely based on chance when the person stocking the shelves needs to solve the puzzle caused by new stock that needs to be shelved and old stock being sold while trying to avoid undesirable gaps on the shelf. End caps are a different story, since those are designated by corporate usually.
Let's play a fun game. It's like "Where's Waldo/Wally" except instead of a guy in a stupid hat you have to spot the 5e D&D books on the roleplaying games shelf at my local Books-A-Million this morning.
Ready...
Set...
Go!
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Follow up questions: imagine you don't closely follow tabletop gaming news and you are just casually browsing the shelves at this store, what version of D&D do you think is the latest one? What game do you think is most popular?
Tongue-in-cheek games aside, I'm quite curious about what is going on here. When I was in store it took me about five minutes to spot ANY 5e books. They are obviously not being given priority shelving or prominent placement even relative to the 4e books. Is this because of sales? Is this because the distributor has dropped the ball? Is this a vast conspiracy perpetrated by the Pathfinder-loving staff at BAM?!?*
* Hahah just kidding. The staff at BAM probably thinks Pathfinder "is kinda like Magic".
At my FLGS, which is WPN preferred store, D&D 5 has a display all to itself and its stocked fully. PF also has its own shelf display (which is 3x the size).
you can tell the owner/staff are really biased towards PF

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.