Oyster Barrier Tailgating

Oh dammit you silly rabbit.
A victimless crime is one without a victim..

There is no loss of utility to anyone in my test scenario.
The train is already going from Station A to Station B, the power consumption required to transport a single extra body is negligible, the cost of taking the payment would exceed the payment itself.

Agreed there is a high social cost as a perceived level of inequality or 'unfairness' is incurred;

So therefore if there is no loss incurred to anyone bu jumping the train then if everyone did it there would be no impact?

In which case why do they charge people to travel at all if it costs more to process that payment than is made from it?

Sounds like they'd make a much larger profit if they gave it away for free.