Yes but then you forget to buy a ticket one day and get stopped by inspectors and fined. Then, as a Londoner, growing up with the stigma of ticket avoidance being such a heinous crime you fell incredibly guilty even though the inspectors are actually delighted that you didn't as it is basically just a way of collecting revenue - no difference if you are doing deliberately or just made a mistake (ironically as you had just got back from London and been so used to using your ticket all the time, you actually forget that you have one). In short: *******s