Comparing per-bottle cost between home-brew and commercial beer helped me justify the cost of getting into home brewing in the first place. Even though it wasn't a ton of money. It was still an optional expense. Being able to calculate what the Return on Investment (ROI) helped me justify the purchases. Plus, I can now tell my wife that I'm brewing this weekend not because I want, but that I have to so I can save us some money!" I don't do that calculation anymore because any purchases now are to make brewing easier or more fun but, not really to make it cheaper or better.
Now onto the podcast...which are almost always awesome! Thanks @denny and Drew!