It depends on what your looking to do. If your looking to make your house note breeding for 100 mice and rats a month wont do it for ya. But if your looking to make a car note or take a trip every year then. I birth 150 - 200 rats a month and thats just to fee my small collection.

Just to give you an idea of what some smaller buyers buy a month, my local herp haunt buys like 300 rats and 500 mice a month. It takes alot of breeders to do that but I do know they buy $800.00-$1000.00 worth of feeders every month