Hrm... i wonder if that's a guy i know that works there. depending on who you talk to, some pet stores have good information.
IMO, petsmart puts a lot of effort into trying to maintain their fish. their system is very high tech and does like 3 water changes a day. the fish health is always pretty good, at least at the one up here at polaris.
Petsmart has a warehouse like jacks and some other chains. this doesnt mean all the fish are 100% heaalthier than other stores, but it's a good amount of effort and impressive for a store that sells dog food the most. LOL. As long as you're happy with the service and product, many different fish stores may float your boat. IMO, petsmart doesnt have the fish i personally desire, but it's not a bad place for new aquarists.