I, too, have an open fridge policy. I don't mind bringing home brew, and home made wine, to parties and special occasions. If someone takes advantage, it reveals to me a lot about them.
Every man according as he purposes in his heart, so let him give; not grudgingly, or of necessity: for God loves a cheerful giver. II Corinthians 9:7
I have used this verse for my view of life, generally (I like a lot of St. Paul's works). It boils down to 5 words: Serve with a glad heart. I repeat that to others who begrudgingly volunteer time, then gripe while helping.
So, now I have the perfect analogy for my garage brewhaus: "Brew with a glad heart". Thanks for tipping me to that phrase! I think I'm gonna look into doing a t-shirt with that on it.