You have to take into consideration of how occupied the chickens are and how well they are taken care of such as vaccinations, cleanliness, ect...... That will reduce the chance of illness and feather plucking. Don't get me wrong the more space the better but some people don't have a whole lot of space be that does not mean that you can just have a few chickens. And I'm not saying that he should get more than six chickens I'm just saying that that if space does not allow he would be fine to get a couple extra. So in that sense the more you have in a single area there will be more Maintnance. A little more than if you had an abundance of space. Plus you have to take in consideration the agressiveness in that particular breed. Such as buff orpingtons or black australorps they would do well as those breeds are laid back. You just have to way the pros and cons. And just because you have a little more chickens than that space allows does not nessacairily mean that they shall be in happy. Again if they are occupied and can stretch there wings and flap and have many things to choose to eat and places to scratch they'll be perfectly fine. @donrae