I took the answer here for granted, but thinking about it over my morning coffee... I've dealt with fry numbers by choosing the parents differently. If you get a little experience, you begin to see what everyone has, and what some people want. If you have fry from what everyone has, then fish breeding in your tanks are a problem. If you do some legwork and find fish that people can't get, fry are a great bonus. You grow them to sexable size and there's never a problem finding homes. Fish breeding becomes fun.