Yes, I make money at it.
Figure out what your market demands. I can sell guinea keets out the wazoo if I price them at $5 each. All summer long I hatch every egg I get. If they start to get a few weeks old and they're not selling, I switch to selling hatching eggs online for a few weeks. Then I'm back to hatching. I give as many eggs as I can to broodys....cuts down on bator and heat lamp costs.
I have a list of swaps. I plan the hatch for the week before I have a swap. I like silkies because they just always seem to sell. I also do blue marans and EE's. (occasionally I'll hatch others, but I live by Pittsburgh and the suburbs people like cute fluffy birds, and pretty colored egg layers) This is just my method, again....figure what your market will bear. My guineas dont sell at all near the city because of noise ordinances. I market those to 'farm country'
Everything gets listed on craigslist also!
I have an auction about 2 hours away. If all else fails, extras can go there. Sometimes they sell really cheap, but it's better then loosing $ feeding them! I also have an uncle that likes to butcher, so if the standard sized chickens don't sell as chicks, I sell the pullets at $10 each and give him the roos. Occasionally I'll butcher for stew birds.
Have a plan: Where you want to sell, what happens if they don't sell....etc.
Good luck!