Get yourself a Jag (managuese) or wolf (dovii) It will happily eat the mollies quicker than you can breed em!
That's why lately I have been despising livebearers. There's not much profit to get from breeding them.
In the past, I have had pretty good luck breeding and selling fancy guppies, with unusual coloring patterns. It actually supported my aquarium hobby for a good number of years. (All filter supplies, food, etc. Plus a new 10-20g tank every month)
Get yourself a Jag (managuese) or wolf (dovii) It will happily eat the mollies quicker than you can breed em!