I think it depends on what you consider "worth it". For me personally... it isn't worth it. Granted I only have 2 balls right now (soon to be adding 2 more), but I also just got out of breeding rats. You have to consider everything your breeding colony of rats would require, not just in money, but time as well. You'll need a place to put them, even a breeding rack takes up space. You need to keep them clean or they will stink and their health will suffer for it. You need to keep them fed and watered, if you use an automatic watering system you'll have to make sure it remains functioning properly so your rats neither drown nor run out of water. Not trying to discourage you, just some things to consider when determining if it is "worth it". For me personally, it isn't "worth it" right now, I personally would not want to deal with it. But someone else may feel very different (especially if they have a large number of snakes to feed!).