Its OK to "hope" to get some cash back. But don't plan on getting any back. Too many things can go wrong: she's not receptive, male can't get it done, she slugs out, gets egg bound, eggs go bad, babies hatch deformed, etc etc.
Not saying this to scare you, but if you're planning on making money, don't. Because you won't. Do it because you enjoy it and its a hobby and passion. Don't do it hoping to make a quick buck.