They eat the extra cockerels because the males are not needed to 'grow' eggs,I could ask the same question about why some people eat their roosters and not their hens. Do you care to opine?
I'll venture a guess. It is not because people are looking to grab some of the mojo of the hen or pullet but rather the people who eat just the cockerels are hormone challenged and these people therefore are looking to capture some of the excess testosterone present in cockerels.
plus 'spring chickens' are delicious.
Sounds like they are selling fighting birds.When raising game chickens the sales side is in the favor of the little cockreles