I thought about it, but space is kind of an issue. Right now I'm still living at home, and there not crazy about me having the amount of animals that I do. If space wasn't an issue I would soooo do it. Also I always wondered how do you always have the right size rodent? I mean balls are only supposed to be taking small rats right? I mean big females getting ready for breeding season that need to gain a few pounds will get mediums, but mostly you need smalls. Just wondering if there are problems with all of that when breeding your own. Also how many rats should one have in order to maintain a collection of 10 balls?