In the MTR network in Hong Kong, there is a well known phenomenon that, when a train arrives Sheung Shui, a load of commuters will rush out of the train, and try to get out and in the ticket barriers, and get back in the train before the train door closes. The reason is to save money, as a through fare to a border station is often more than the sum of a local fare and the border crossing section.
Similar savings can be seen in London around border stations, for example, East Croydon, Upminster, Amersham, Watford Junction, etc. Not only a ticket dance is a necessity for those using Oyster, but also saves a lot of money for contactless users as well.
Has it resulted in unmanageable crowds bombing the ticket barrier whenever a mainline train arrives the station, trying to get back on the same Southern / c2c / Chiltern / LNR train?