So I just stopped in to my local shop during my lunch break to pick up some Jack's Abby Private Rye. They tweeted four days ago that it was in. I found four 4-packs on the shelf and grabbed them. I had planned to buy three, but I saw four and decided "what the heck." The guy at the register says "whoah, did you just buy us out? "Yes, I think I did." He said "bad karma, man, that's generally frowned upon in beer circles." I offered to put one or two back but he said "no, I'll sell it to you, I'm just sayin'." Now this is a seasonal, but by no means limited beer. I told him "I think they're going to be making this one all spring, you should be able to get more." "Oh, really? I know we have trouble keeping Hoponious Union on the shelf...." So, anyway, what's the deal? Is there some sort of unwritten rule that one never buys all of a particular beer off of the shelf? Am I supposed to always leave some behind for somebody else, even if it's something completely easy to get and restock? Is this guy a jerk or misinformed?