The main issue is not necessarily feeding. The main issue is that it is unnecessary stress to the snakes. Just because you don't "see" a problem, doesn't mean it is not there. Ball pythons by nature are seclusive creatures. They don't make "friends", and from what I've read they don't stay in groups even in the wild. To force a snake to live with another one, to share hides and a hot spot is just unnecessary. Not to mention, if one gets sick they both do, that's double the vet bill and completely avoidable. Also, if one regurges you won't know which one it was. All this, and this is on top of the fact that cannibalism has been recorded and has happen, although rare, in cases where they are housed together.

Like I mentioned in my original post, the cons severely outweigh the pros, if you want to risk all that just to save money on a different enclosure that's your decision.