Requesting contributions ...
People have successfully housed multiple snakes together, but that doesn't mean it's the ideal way to keep them. If you buy them together like that, you don't have to worry about quarantine issues because if one has mites, the other does too, etc....but you still run into all the same issues long-term.
There's feeding issues...and even if you feed them separately, outside the cage, one can still smell like a mouse and get seriously bit by the other after you put them back.
There's illness issues...A snake can be healthy one day, and sick the next. If this happens with two in the same cage, you'll most likely end up with two sick snakes. And if you see a bad bowel movement, you won't know who it came from.
There's comfort issues...We see two snakes curled up together in the same corner of the cage and think, "Aww, how cute...they're cuddling together," when in all likelihood, they are actually competeting for the one spot in the cage that has the right temperature of the moment.
There's sexual issues...Two males may fight when they've reached sexual maturity. A male/female pair may mate prematurely, before the female is old/big enough to safely bear eggs.
We all know how sucky pet-store husbandry is, 99% of the time. We see them housing multiple snakes in the same tank. Why would we want to imitate what we see done in pet stores???