Yeah. I've seen baby balls and baby boas housed together in a "reptile store" in my area. When I mentioned that it wasn't a good idea to house them together, the guy said that they've never had any probems.

Of course not.

I like the place I went today to buy rats for my non-f/t snakes. The snakes in that shop are housed individually, and the hides are turned so that the hole faces the side, not the front.