A father amusing his young son by acting out YMCA with the rest of the crowd. A pair of businessmen, entertaining colleagues. Two teens embarrassed by their kid sister, who takes all this stuff too seriously. Mostly there are fans and families. This is entertainment.
Parents bring their kids, have a good time at a reasonable price, and come again a few weeks later.
Church groups cheer when their name shows on the scoreboard. Season-ticket holders chat with their neighbors, scan the crowd for friends, heckle the sales staff. Visiting parents and other guests generally sit with the wives. There are often scouts in the stands. They don't seem to look for the same things the rest of us do.