"Linus Torvalds Explains The Reason Linux Lost The Desktop"
Initially a post order-only for consumer electronics, but added bricks & mortar stores because many customers (of all ages, btw) prefer IRL service, viewing and touching actual hardware.
That did Fry's in, didn't it? People coming in viewing, touching hardware in store and then buy it on-line (elsewhere) so that they could save 2.5%. Or worse, buying it in store and returning it two weeks later when they found a better deal or didn't need it anymore.
Here a lot of places has a sort of price guarantee that I guess is supposed to work against this. Basically, if I know Media Markt sells something I want, but the very same thing is available for cheaper in other (big) store, I'll show them their competitors pricing and they'll lower their price to match it.
Assuming by the fact that the physical stores still exists, don't seem to be going anywhere soon, and these companies tend to get rid of stuff that doesn't make them profit anymore, I think it's safe to assume they at least are net positive on having the physical stores.