Because in some places it may be illegal. It's also something you don't want to do if you don't have some one to teach you.Here's a question...nobody has broached the subject as od yet but it was common practice back in the day to caponize the extra cockerels so that they would focus on size and weight gain.
Of meat is a foremost consideration, why not simply caponize and focus those culls for meat production?
Random thought at 2am.