There is never a reason to keep a bad roo. So many good, quality roosters are looking for homes to save their lives. Once you have 20 posts you can participate in the buy, sell, trade forum on BYC. You will find many roosters - show or breeding quality at very reasonable prices, sometimes even free.
One rooster can handle 10 hens any less and he can end up overbreeding them to the point of damage or death. If you don't need fertile eggs to hatch, or to sell, you don't need any rooster. The hens will be happier without the harassment and will continue to lay just as many eggs.
Pretty is only skin deep, nasty can go on forever in their offspring, etc.