I can't answer why they exist, they just do. This phenomenon exists with Bananas/Coral Glows. Male Makers will make 90-95% males, and Female Makers will make 90-95% females. The non-bananas in the clutch will be the opposite sex. For example, I just hatched a clutch from a male maker banana and I hatched 5.0 bananas and 0.3 non-bananas. To simplify:
If the banana parent is a male the male banana hatchings will be "male makers"
If the banana parent is a female the male banana hatchings will be "female makers"
Female bananas seem to throw normal sex ratios.
It is pretty interesting. So far it's the only known BP morph that works like this. I'm curious what the supers will do and what happens after a few generations.
Yea it's odd there are people trying to prove it wrong, But as of now, what Dave green said is right! not always a bad thing!!! Just make some powerhouse males with the banana!