Originally Posted by findark

Sure, but that's just saying that BART is more effective at enforcing their fare policies.

I agree that with paper tickets gone now it would be pretty hard to actually pay the Millbrae fare while hopping the fare gates at SFO (rather than paying nothing or a penalty fare for not tapping out), but at that point the argument becomes something like "it's acceptable because I can get away with it", which is a really common self-justification for questionable conduct but I would like to see it tried in court