I think you are new to this (might be wrong). IMO roosters take experience. A lot of experience, and a LOT OF ROOSTERS do not turn out, they are either aggressive to humans, or to hens or to both.
Chickens can be such a fun hobby, but their behavior can ruin it. Roosters especially have ruined it for a lot of people. Most of us come to the conclusion that you cannot keep most of them.
So I think that is the ratio that is likely to be the problem. Too many roosters make the chance of it not turning out, skyrocket.
Mrs K