I don't usually respond to this type of thread because I am at the match watching until the end and don't notice but today I watched on TV here in Vancouver with my two granddaughters and their reaction was "if they gave me a million dollars I wouldn't leave early Gran, I wish I could be there to tell them to stay and watch until the end"! They are 8 and 10 years old. And that was without me making any comment whatsoever. They did ask afterwards if I ever left early and I replied no, because I respect the players.
Watching it I could not believe that they were announcing the attendance figures whilst we were witnessing what appeared to be a half empty stadium. Surely traffic is not more important than watching your team finish a match to applaud them off the pitch? People complain that the players don't acknowledge us at away matches, can you blame them when we can't acknowledge them at home matches?
I do not include the people who leave early for a genuine reason, just those who think that, as the OP says, "avoiding traffic is more important than City".