I don't think it's realistic to expect a family of four to have a good time sitting through a three hour baseball game without any food. And if their historical pricing data is correct, food and drink prices were comparatively much more reasonable in the 60s, so it's not a inherent property of ballparks to have outrageous concession prices.
> One last thing is to note that the experience at the stadium has changed enormously. Stadiums in the 60s were basically a bigger version of high school bleachers. Now they’re luxury palaces.
Here's a picture of the seats at Coors Field today [0]. Here's some pictures of 1960s baseball stadium seating [1][2]. They look pretty much the same to me. Now you get a cupholder, I guess?
[0]: https://www.thedenverchannel.com/sports/rockies/heres-what-g... [1]: https://www.nytimes.com/2019/08/19/sports/baseball/al-jackso... [2]: https://nxstrib-com.go-vip.net/wp-content/uploads/sites/5/20...