It is great to hear that your balls are okay. I don't house multiple balls together past their first shed unless I am trying to illicit breeding responses or feeding responses.

The idea that however that it is out of "lazyness" or "convenience" to house multiple snakes together is silly in my opinion. I know tons and tons of breeders who keep all their boys paired up year round until breeding season without incident. I also keep my burms, carpets, cornsnakes and rainbow boas in pairs and I have to be way more on top of things in terms of feeding, cleaning and such. It is not easier, or more convenient.