the same thing happens at the exotic pets store where i used to buy live feeders. They had a 10ft burmese, a 6 ft boa, and a 4ft green iguana all in the same 50 gallon tank. They all seemed to get along, but that's not to mention how they had their dogs and cats, which probably all came from one puppy mill or another. Im sure they dont wanna hear it, they probably do it because its easier, they really couldnt 'care less about the animals, its all about the $$. They rely on people coming in who dont know anything about these reptiles but are wowed by exotic animals and buy them impulsively.