Unfortunately this doesn't scale well because in most places where you can keep chickens within city limits, roosters are forbidden. If you're only buying female chicks, then you're supporting the practice of just dumping all of the male chicks into wood chippers or just suffocating them by dumping hundreds of them into tied-up trash bags. (Note: Those are both 'industry-standard' practices. Some animal activist group tried to sue a farmer over those practices a while back and the judge ruled that he did nothing wrong because he was following the industry standards.)