There is a good chance nothing will come of the ghost babies. They are difficult fry to raise, so don't feel bad if they don't make it. The parents will eat them, they have difficulties finding food, etc.
There are other ways to sex a mystery snail, but it can be difficult. If you do end up with eggs and grow the babies out, you could probably sell them pretty easily here in the classifieds section. :)
Remember that the tank your fish lives in is his or her's whole world. Ask yourself this question, and answer it honestly: would you choose to live there?