Take for instance what Bunnings has done to the Mitre 10 brand.
The moment there's a lower price that's at least as convenient and serviced, we're gone.
Another point of anecdata is what Amazon and other overseas stores have done to local stores.
Loyalty by older generations perhaps, but younger generations can see how much we've been screwed by local retailers for years.
E: the reason Starbucks failed was because they sold American style coffee, which not enough people like. Cafe culture is incredibly picky about exactly how to make good coffee, so all the chains that hire uninterested inexperienced kids off the street all have problems in places where there's a lot of quality coffee.