Jumping the turnstile in New York may make economic sense:
A report by New York City’s Metropolitan Transportation Authority seems to prove that hopping a subway turnstile is worth the risk of getting caught and fined. The MTA estimates that riders entered the subway without paying 18.5 million times in 2009 (an average of 50,684 a day) while the police issued just 120,000 summonses, or 1 for every 154 jumps. The report figures that a regular turnstile jumper has a chance of getting caught only once every 6 to 13 weeks. At $100 per fine, this works out to be cheaper than a $27 weekly unlimited Metrocard that would cost $162 over six weeks.