i see all aspects of this in the market.

for breeding, you need lots of females and a few males. but they hatch out in a 50/50 ratio. the females produce the eggs and the number of females determines the number of eggs, while a single male can contribute its genetics to lots of clutches.

so in the powerhouse animals, with new and rare genes or with awesome multi-gene combinations, the males are more expensive. and in morphs and combos that are more common and where the price had time to come down, the females are more expensive.

basically when a new and expensive morph hits the market, like lets say bamboo, there is demand for everything, but the males will be much more expensive because they allow you to produce more bamboos, and faster. once the price starts coming down and the morph is more available, you start to feel that the market for breeder females is larger than the market for breeder males, and it eventually shifts.