you never KNOW they will hatch, and even if they lock you could always not get eggs or slug out. you can also get eggs that are infertile or just go bad for no/whatever reason. or babies that die in the eggs for whatever reason. we had a female last year, she locked up more than any other female, and didnt lay 1 egg or slug
hows that old saying go?
oh yeh, dont count your eggs before they hatch