Is it worth breeding rats?

[VI Reptiles]

Hi, I got my first bp 9 months ago and now im getting 3-4 more next weekend. Is it worth it to get 1.4 Rats or is it not? Im planning by the end of 2005 im gonna have 20 bps hopefully and then im guessing i'l need rats constantly. It costs about 3.00-5.00 for a nice rat up here that is alive but I dont have any trouble putting it in a small box and putting in the fridge for 3-4 hours and letting it die from freezing. Also Im not allowed to keep any Rats/Mice inside because my mom hates them and would kill me if one got out! Since rats dont need heat and the lowest temp it gets out here is -10. I think they could survive as long as there cage wouldnt fill up with water and they would die from drowning and if they would id just put them in the freezer and feed them to my snake. Im thinking maybe 2 males and 8 females would be plenty and after a good year of producing (Febuary - October)they could go in the freezer so im not wasting rats. Tell me what you think cause I need to know soooooon