Its rarely worth the hassle to keep snakes together, that is a good statement.
While some people have no problems housing together, you are inviting problems by doing so.
When housing together your risk for certain issues is quite high, but when housing alone the risks are near zero.
1. Cannabilism. Doesn't happen often but it CAN and has happened before.
2. Early breeding. People are always keeping them together with no thought to the fact they have no clue what sex they are. Early breeding can lead to death for the female. Not everytime, but its a concern for sure.
3. Sickness. If one is sick, and you house togther. ALL will be sick if its a passable disease.
In the end there are many reasons to house seperatly, but NO reasons to house together. This is why most people house snakes alone.

If you must keep them together (although i dont know why you would) then feed them seperatly.
bmm