My experience at Busch in 2011 was actually the opposite. We were in pretty good seats on the third base side. My wife and I had gotten up to get some food. Yes, we left during a break in the action. After we got our food, we stood in the aisle above our section, so as not to interrupt people in the middle of the inning. We were in front of a wall, not in front of anyone's view. The usher said, "You folks need to go to your seats...you can't be standing around here." I looked at my wife, shrugged, and we made people stand up in the middle of the inning. Their rules, I guess. Same thing at Miller Park behind the field level around home plate. A few years ago we were sitting in the last row and my back was getting a little sore so I got up and stood right behind my seat. The usher was right behind us and watched me do this. After about 15 seconds he told me I needed to sit down. Although I think most ushers are just old guys who need the power trip for their ego. They have no problem telling people to sit down or asking to see your tickets to make sure you're going to your section but will do nothing about drunks or generally annoying people unless forced to.