it's a nicely written post and although I do believe the costs made to reduce the faire skippers is out of proportion I also believe you should mention another important fact.

That is that the more money that is being put in to prevent it the lower the damage will be. A good example is tax evasion. The bigger the chance of getting caught is, the less people who will attempt it. Thus if you reduce the preventive measures this will automatically go up. But yea again I do not believe 150m weighs up to 100k.

Actually I might've forgotten another factor. I believe and please do correct me if I'm wrong. Is that a lot of misbehaving people on the trains also skip the train fair. So it be 2 birds in one stone, safety and revenue.