I tend to be rather stingy with my beer when my supply starts to run low, as well. It's your beer, share if you want, or don't. I've had a few "friends" who just wanted free beer from me, and didn't care what it was. I'm not too concerned if they are upset with me. Just tell the moochers you are out, and the next batch won't be ready for some time. And share with those who will appreciate it, even in small amounts, privately somewhere else.