As an employee of such a store I can tell you that the vast variety of merchandise and easy access to information and opinions about it on the internet, and the ease with which consumers can cross shop, or worse, "showroom*" has made running a B&M store very, very challenging. The gear is costly to maintain for demo, retail square footage is costly, employing motivated knowledgeable people is costly, and everyone thinks they deserve a discount! The growth of direct-to-consumer (cutting out middle man profit) marketing with 14-30 day free home trials and free shipping, etc. has distorted the "value proposition" of traditional retail. No dealer can offer all that without a robust volume of sales and strong margins, and there just isn’t that large a market in any but the biggest cities...or the opposite...where real estate is cheaper, but customer density is low.
*Showroom...the practice of visiting stores to audition merchandise, but following up shopping for the lowest price among outlets not offering showroom facilities.