Can't wait to get the sign up that TonyP made me. I might be able to afford this after all!
Does it say
Gas, grass, or ass, no one drinks for free
Propane, malt, or sex just doesn't have the same ring to it.
Something else you can do weaze, I can't remember if someone mentioned this. Put up a whiteboard where everyone can see it and track your expenses for the year on it.
You can also track time spent and gallons produced. It's a useful exercise at the very least, but it will lay it out for them pretty clearly the time and expense of the hobby.
Another thing you can do is let them buy you sacks of malt and in exchange you let them pick the next beer to be brewed and name it after them. People love having beers named in their honor.