If you are buying "meat chickens" there is no reason to caponize. They are slaughtered at 6-10 weeks, WELL before maturity. If you are buying heritage or dual purpose breeds that is where you see the benefits of caponizing. It is easiest to caponize about 6-8 weeks, but can be easily done up to 3-4 months still most of the time. I have no experience with older birds but I know as the testicles grow it is increasingly difficult to perform the surgery. They will "play fight" from 8 weeks up to about 4-5 months old, after that it will depend on their temperament and personality as to when the real problem fighting starts. Some boys raised together get along really well for a long time, even permanently, but at any point they could snap and you would have to separate.
I have no intention of freezer camping 50 to 100 chickens at a time. The plan is to get heritage breeds, primarily, and a couple of dual purpose breeds, to add in, and harvest them, fresh, from the hoof. I want them to live long, healthy and happy, primarily organic lives. Then they go to the cone, fresh, from the yard, when we want to cook some chicken. I'm primarily interested in the Dark Cornish, simply because I keep reading that they are more pheasant like in flavor, having mostly, if not all, dark meat. I'm a dark meat guy. I don't want, nor would there be any real advantage, other than humanitarian, to getting the kind of meat birds, in the quantities we are looking to have, then slaughtering them young, and putting 100 chickens in a giant freezer. The idea is since we have room, we'll raise them fresh, and provide a healthy, humane alternative, to commercial chickens, to out families and friends, here locally. Not looking to make money. Never figured on doing any of this for profit. We just don't wish to support Tyson, Pilgrim's Pride and others, in their treatment, of poultry.
Our turkeys, for holidays, and otherwise, are Heritage breeds (Narragansett, Bronze and Red Bourbon). Why not get our "everyday" chickens, from the same humane source? And once we are setup for larger livestock, we'll do the same with swine and cattle, too.
So, yes, caponizing, sounds like our best option.