We are not as scrupulous as Singaporeans, in regards to the payment of fares, on their trains and buses.
Even if the buses were full, when I used it, long time ago now, you do not see any freeriders.
Neither do you see people jump the MRT turnstyles, I bet that at some of the Melbourne ones, with turnstyles, some people would jump it, and some stations dont even have turnstyles, or gates, so its a free for all.
I think too, that in Adelaide, everyone knows the group of 30/40 assortments of guys and gals who do the ticket inspection, on the buses.
Must be nice to do a fare dodge and not get caught, not so much for the pensioners/gold card holders, but the young ones esp.