Back in the day we would sit in the bleachers at County Stadium for $2 and bring coolers full of beer in with us.
I used to ride my bike to Tigers games when I was a kid, we'd get in for free sometimes but bleacher seats were $4. I grew up out there, learned a lot about human nature and seen a lot of bare boobies thanks to the BYOB policy in the bleachers. People were hammered and having a great time, several beach balls ended up on the field.
The $2 was a promotion, I think something like $2 Tuesdays. Normally, it was about $5 to get into the bleachers.
Wisely, the old County Stadium was set up so the bleachers where separate from the rest of the stadium, to keep the drunken kids and degenerates from mingling with the regular fans.

So was Tiger Stadium, it was like a self-contained prison.
Take a look at the photo, if you look over into right field you can see the ten foot blue cage separating the bleachers and the grandstand. For afternoon games there is no way you wouldn't see someone trying to climb the fence at some point, or fall down the stairs drunk and almost fall onto the field.
I went to most day games in junior high, until my bike got stolen and I had to call my Dad to come pick me up on his way home from work. Luckily they thought that was the first time I had rode my bike 8 miles through some of the roughest neighborhoods in Detroit at the height of the crack epidemic. I saw some weird stuff on that ride.