I heard Puriti was going for a record on most baby mollies in one tank...
Other than that, baby fishy cuteness might be enough to convince the significant other that you need another fish tank.
Eventually though you'll have converted the backyard pool into a 20k gallon molly tank, and you'll probably want to find a fish store locally that will take them before then. Many will give you credit, not much for mollys. But even if you only get a penny a piece, at the rate they reproduce, you could own the store in a year...