Everything I purchase for my snakes I think of as spending on the hobby. I've never thought "I wonder how much I can make if I breed", only "That would be awesome if I could break even--I'd have a self-sustaining hobby".

What I'm trying to get at:

Don't breed for money. Breed something you're interested in! Don't breed if you aren't really interested in breeding, and just want to try to make a profit.