I have 27 snakes and all except 2 are eating ft right now. I have heard (don't quote me on this) people say that breeding rats takes up more time then caring for their snakes. That the cleaning up after the rats is worse then cleaning up after snakes. Personally, I got into this hobby to spend time with my snakes, not rats. I buy in bulk from a rodent supplier...that works well for me.
But by all means...don't let us discourage you! You could start with a 1.2 ratio and a couple tanks and see how it goes...if its not for you, feed them off and go back to ordering.