[throwaway313313]

Alooong time ago before this kind of same station exit fee existed, it was very widely know among teenagers that you could buy a ticket with the lowest amount required so that you could exit the station and so what would happen would a bunch of teenagers would buy cheap tickets and then do all kinds of money saving maneuvers such as tail gating their friend or a stranger through the exit gate while holding their ticket in their hand just above the machine etc, so that they did not consume any fare at the far side yet still had a ticket visible and weren't jumping over the gate. It was super widely know and many kids would tour the whole bay area for super cheap on weekends if they had nothing better to do.

I'm just saying this is why they came up with that fee.

Obviously any adult with a real job wouldn't stoop to such antics.