I think that the thought behind 'male-makers' is the market for combo morphs. EX: breed your male maker to an adult female pied, hold back all the male babies which will be bananas, power feed the heck out of them and you'll be able to get at least one of them up to breeding size quickly so you can breed it back to it's mother the following season and produce banana pieds in only a year. Personally I think it's a benefit that's a bit overblown.