Free riding

Oyster cards seem a great idea and they do work on the tube with controlled entrance and exit from each station but on London buses they are a joke. I took a short journey on a bendy bus today and counted the number of people who got into the bus via one of the centre doors without "touching in"; I made it about 40% ignoring the machines. Many people are getting a free ride on London buses, maybe that is what "cuddly" Ken Livingstone wants but do the rest of us really want to subsidise the travel arrangements of freeloaders?