Would it be easier to put signs up when you walk to your seat from the concourse(similar to the watch out for flying bats and balls) that says "please refrain from leaving your seat until inbetween innings". But what about the impulse buy? You can't let these people think it over and convince themselves they don't need the nacho fries in a baseball helmet. Also, you're assuming most people in attendance know what an inning is, much less what it means to be between them. As an aside, I'm not sure how many people travel to densely populated places, are often around large groups of people etc. But you get all types. You also tend to learn that it isn't their problem they're annoying you. You learn that you have to stop being annoyed by little things and ignore them. Maybe some person gets up every 2 innings at bad times or takes forever to sit down in front of you. Look around them. Maybe some guys are drinking, having a good time and swearing a bit. Ignore them and if you have kids with you take that opportunity to teach them why this is low class behavior (or sit in the family section). Or maybe someone is a fan of another team and is acting like they're winning the world series after every called ball. Cheer for your team then. The point is we don't need rules and laws etc because someones ideal of a baseball game is being violated. Just stop worrying about other people and focus on enjoying yourself. Don't let people ruin your good time and if anyone has a problem with you ignore them. I've seen too many people just sit there like wet blankets, angry because someone around them was ruining their good time. The only person who loses is the person feeling like that. As an example, I hate the wave when the Brewers are down or tied or its close and it's the 4th inning, etc. I found that because everyone around me doing it is an idiot, it's more fun to just mock them. Yeah I hate how they get up every 10 seconds trying to get the thing going and I miss pitches, etc. Whatever. It's not going to ruin my good time. If you can't stand being around lots of different kinds of people for a few hours then stay home. There's idiots everywhere. Learn to ignore them and be happy.