In the central area, passengers have no clue as to whether the train in front of them is on time or late. All they know for sure is that it is there and that they can squeeze on. Hence, they will arrive at their destination sooner than waiting for the next train.
Personally, I'll let one sardine can go. If the next is just as bad, I am another sardine.
I can be quite picky, sometime waiting for up to 30 minutes until a train comes in with a seat.