I actually liked my last roommate going through my beers. Allowed me to brew more and, in my opinion, one of the best parts about this hobby is when people like your beer enough to have a serious session with it.
I just need to start bulk buying grain to really take my costs down (already by hops by the #, get the cheap RO water from the grocery store, and often get free yeast from a local brewery, reuse a slurry, or go dry)