As a kid in the late 1980s, a friend's father was a season-ticket holder. He had seats right by the home dugout. The thing is, he was terribly obese, so he couldn't fit his butt between the armrests. The team agreed to remove an armrest if he bought two tickets.
Since he normally attended games by himself, he always had an extra ticket. At that time, the team allowed you to trade unused box seat tickets for a general admission. They also would let you in if you returned a BP home run ball from beyond the OF fence. So I pretty much never paid to get into the ballpark!