I shop at our local PetSmart all the time. The people are really nice. They have tons of items in stock. Mostly their prices are fairly low. I love their fish aquariums and the way they work with the local SPCA to rehome strays, etc.
Then they cram all the lizards, frogs, snakes, birds, etc. into these super small spaces and do minimal, even careless care of those poor creatures. They price them so that they can turn them around (sell) them quickly but that doesn't always happen. So they become like orphans in early 1800's, cast away and left to fend for themselves.

I bought our first chameleon over a year ago from a PetSmart. She was housed in a 10"x10"x10" terrarium with a bowl of water and a plastic aquarium plant. They didn't know how old she was, where she'd come from, or even that she was female! She lived 3 (three!!!) months and suddenly dropped dead. It never grew very large, or had much color, but was the most loving lizard I'd ever seen. Even my wife got attached to her, then POOF! she was gone.
The problem with any pet store like them is that they limit space and care and try to "mass merchandise" them as if they were bags of feed. No fault of the employees, rather the merchandising mentality of the top dogs.
So, whenever I can, I try to learn something new about chameleons and then share it with the workers. Mostly they seem to appreciate it. Usually they haven't time to initiate anything I share with them.
On the flip side, whenever I walk into their store, they know what I need and nearly run to help me. A lady met me at the door a couple of days ago and said "Crickets today? How many?" and motioned for someone to go help me.