There used to be an old school sports shop at the end of my road where I grew up, the guy in there told me (while closing it down after 35 years) that the reason it all went wrong was that Nike and Adidas, or at least one of them, took all their product lines out of said shops so that you had to buy either direct from their own boutique places, or from Mike Ashley who presumably places a preset massive annual contract with them. Lord Nike, or perhaps Ashley via them, was fed up with Dave's Sports having access to their gear. A tale as old as time, really.