I was just in the Petsmart here locally on Wednesday. I made it a point to stop by the chinchilla habitat to see how their care was. They had pellets, hay, a dust bath, an igloo to hide in and branches to climb on. They cage didn't have bright lighting either. I was pretty impressed with it actually. I stopped at Petco as well and they didn't have chins there at all, which surprised me, as they always have in the past.
I think just like with pet owners and breeders, pet stores are hit and miss as far as the care they provide. Some do it right, some don't. Hopefully the more people keep pointing out what they are doing is wrong, the more the changes will be made. If you have a problem with the store, do as Dawn stated above, and use the number to call. I never spazz out on the managers or the people that work there, and thankfully I've never been asked to leave a store. I just explain that I am an owner and breeder of chins, and X is not the best idea for them and why. The people I've spoken to are pretty receptive. The manager told me they get guidelines from corporate, but she agreed that that isn't always necessarily correct, and they try to take care of the animals as best they can. Keep in mind, what resources do they have? They have the internet most likely. 9/10 times the information on the internet sucks. Many sites say to give chins fruits and veggies, and that's what they have to go by.