Yeah but most shops are buying from reputable suppliers, the lady at the store told me they tend to have most stock when someone has shut down their tank. They go straight into the sales tanks with whatever is in there. So you're potentially getting someone else's problems.
Some of the better shops won't even buy fish from the public.
The other thing that bothered me is that half the time they don't know what's in their tanks. Ie I bought a horseface blenny from them but only after a long conversation convincing them it was just a blenny. The guy who sold it to them told them it was a rare goby & they wanted $60 for it. I paid $35.:confused: