For me the issue is not an overall number of boys or girls being born in my cattery as a whole, rather all girls or all boys being born from certain lines that I am trying to breed. It seems that certain cats (projects) will only always give one gender. It took me 2 months of breeding before I ever got a female snowshoe red so as you can imagine it takes the joy out of breeding for your dream cat because you will never be able to breed in those traits without getting a male & female kitten pair. Along with not knowing the gender before unboxing, and the 30 minutes wait time, it certainly makes you want to quit sometimes out of pure frustration and anger at all the useless boxes, wasted breeding time and money down the drain.
PS. I know I am not an isolated case as Ive also heard other breeders saying the same thing about certain lines only producing one gender.