I've heard of shops losing their accounts and almost all of them were the shops doing.
-Up charging over box price
-Keeping whole size runs of shoes and posting for sale on ebay/stockx
-Not paying their bill
-Releasing shoes prior to release day
Now the practices I don't agree with that I think they have gotten away from at this point, this was during the last dunk craze, was sending a bunch of shit products and charging the shop for them and not offering buy backs. The shops would blow through dunk inventory and then be stuck with 2 full size runs of zoom tre's, team editions, air regimes and Prods and a $10k bill due in 30 days.