Snakes can be kept more than one per enclosure. It just takes time, forethought, preparation and knowledge of the species chosen.

I wouldn't put a ball with a king cobra, however .

I see a lot of references to "breeders do it this way". Breeders use one snake per tub because it helps them accurately keep records on all of their snakes. Also, the tubs they use aren't big enough for more than one snake to cram into...

Chris