Best Buy did a good job over the last few years changing their stores to be separated by brand.
These sections are essentially vendor paid. So the big boys like Apple, Samsung, Google and even LG I'm sure are covering alot of the overhead by having these dedicated areas.
I remember the money that would come in through the back end just from vendors who wanted a single display (to showcase a laptop, for instance), or a feature item in the flyer. The items sold at negative margin but all the back end funding that was given from the vendor offset all the loss and made it profitable.
Honestly I'm shocked how busy my local ones are no matter when I walk through hit.