I like the idea in theory, but roosters will fight if they are in the proximity of females. You could keep an all male coop and run far away from the girls, if you want - then keep fingers crossed whether they get along with each other or not.
If it were me, I'd advertise the roosters on craigslist, or send them to a local livestock processor who will do the deed and process them for you, give you back some nice juicy chickens for the freezer.
When they are about 18 weeks old or later, when sexual maturity kicks in, they won't be so sweet anymore. Young cockerels (that's what you call young male chickens; they aren't really 'roosters' until they are a year old)... anyway, young cockerels frequently turn into little heathens at about 4-5 months of age until 1 year. Their hormones drive them to be very, very feisty, attacking each other and even humans.
If you're hoping to keep one (just ONE for ten hens) for breeding purposes, then watch them for the one who keeps out of your way and isn't aggressive to the others. You don't want one that's a pansy, either. Get rid of the rest. Really, get rid of them one way or another.
Otherwise, you'll have a pen of pet roosters away from the hens, who will sometimes fight each other, and especially their mother 'hen' who mingles with them sometimes to bring them food and treats. This is not a quality life for roosters. They need to be near hens to breed, guide them to food, herd them when needed, and protect them from predators. Living in a bachelor pad for the rest of their lives isn't a happy life.
