On a completely unrelated note I was curious who the big market teams of my game would be, so I grabbed the attendance figures for 1967-76, added them with some rounding and averaged them over the available number of years. Here are the results.
Code:
LA Dodgers 2.04m
NY Mets 1.85m
Boston 1.68m
Cincinnati 1.66m
St. Louis 1.60m
Detroit 1.54m
Philadelphia 1.32m
NY Yankees 1.27m
Chicago 1.27m
Houston 1.24m
Pittsburgh 1.13m
Montreal 1.09m (based on 69-76)
Kansas City 1.08m (based on 69-76)
Atlanta 1.04m
Baltimore 1.01m
Minnesota 0.99m
LA Angels 0.99m
Milwaukee 0.93m (based on 70-76)
Seattle 0.91m (based on 69 SEP, 70-76 CHW)
Oakland 0.86m
San Diego 0.85m (based on 69-76)
Cleveland 0.77m
San Francisco 0.77m
Washington 0.74m (based on 67-71)
The Pilots are a special case since IRL they didn't survive. One year of data isn't really meaningful, so I gave them the relatively weak numbers of the one team that's no longer with us. As you can see, CHW did have serious trouble in the late 60s/early 70s...but Milwaukee wasn't much better.