Sounds about right. For the record though, I have never been in a pet store that all snakes were in seperate cages.

The Petco down the road from my house has ball pythons in a cage with a humidity level around 15-20% but they were spot on with their bearded dragon display.

The Petland in Topeka actually has a great reptile section, even though some snakes are still housed together (not mixed species) the person that takes care of them is a well known Boa Constrictor breeder and was the first in the world to produce moonglow boas I believe.

I know that one store I go to sells about 5-10 ball pythons a week. Could you imagine the housing to keep each individual snake in their own cage for the short periods of time they have them in there? And that is just their Ball Pythons. Not condoning bad husbandry, but it is what it is.