Just watched the footage of City v utd nov 1972 in the 'Rodney Marsh under Pep' thread and its noticeable ,that with 5 mins to go,there is a steady procession of fans heading for the exit in Platt Lane..as they watch Marsh and Buzzer male buchsn and charlton look silly at the corner flag..This is a derby match remember.
Made me think back to days on the Kippax,there were always fans leaving early to beat the traffic in the 80s /early 90s...no one moaned then,loads did it...
It wasnt anywhere near as noticeable on a terrace,but of course in an all seater stadium the issue is more pronounced
Maybe...just maybe..we (and other clubs) have always had hundreds of fans leaving early,there just wasnt the visible empty seats for folk to comment on.