The Cubs sell out every game, they don't really need to advertise the team. The Bears sell out every game and they are putting out commercials. Advertising does more than help ticket sales. The Cubs mostly run radio ads, although they do run TV commercials during Cubs games (advertising Batters Eye Suites) This is the first big marketing campaign by the Bears in years though, according to the articles about these commercials. I'm not sure the Bears will be playing to full houses given how woeful this offense is going to be. Sure the seats might be sold, but the Bears will miss out on the extra revenue with 300% markups (beers, parking, etc.)