What is "The Bottom Line"? It's usually spoken about in business when you are trying to figure out how much you can make over expenses. In car restoration, you might think of it as how much value you'll get out of the fully restored car verses how much time and money you had to put into.
As for the Parable of the Lost (prodigal) Son? How much did it cost the father to welcome his wayward son back home...and did the father come out ahead?