Hi Greyfields! I don't know if you have any specific person or persons in mind, or if you're just posting in general, here's my reasoning.
I understand what you're saying, but I'm not talking about raising heavy breed cockerels. I want to find a good cross between 2 or more breeds, that will produce something similar to the red bros, (and I'll probably raise some red bros while I'm trying to breed up something different) but that I can breed myself, and not have to forever and ever depend on being able to buy chicks from somebody else.
Being able to hatch and raise my own chicks from my own chickens, is important to me. I have no problem with hatcheries, or people buying hatchery chicks, but I've decided I want to be my own hatchery.
If I were wanting to raise them for sale, as you do, I'd probably go with the red bros. But this is for my own household only. Quick turn-around isn't a really consideration. The coop, pasture, and enclosed runs are already there, whether I'm raising meat birds or not.
On feed costs, I gather from reading other people's comments that the red bros and other meat breeds all take about the same amount of feed from hatch to hatchet, the Cornish X's just go through it faster.
On the time it takes to raise them, well, I'm tending my regular flock anyway. I feed and water them all at the same time, so there's not a lot of additional time involved beyond what I do every single day anyway. Once they're out of the brooder, anyway. I feed, I water, I do whatever clean-up or maintenance needs to be done, I go back to the house or garden or whatever, and the birds run around all by themselves and be chickens. When I raised X's, it was a pain because they stay inside mostly and eat and poop, so there is a lot of extra work, just in cleaning the coop all the time. I want birds who will go out and forage, and spend their daytime pooping hours mostly pooping outside, while eating bugs and grass and weeds. I have a LOT of bugs and grass and weeds.
I really don't want to raise Cornish X's anymore, though I will be using purebred dark Cornish roos as initial breeders in my experimentation.
I don't live anywhere near a Whole Foods, it's 150 mile round trip to the nearest one. Besides, since I'm going to keep chickens in any case, (I haven't been without them in about 15 years) I may as well try breeding something more suitable for my own needs than I've found so far.
My birds don't get massaged or manicured, (do people really do that?) but they do free-range. I can't call them 100% organic, because I don't buy organic feed, (I haven't even seen organic feed around here) just non-medicated feed.