I dont see what the big fuss is about. If you speed, you will get caught, if you dont then you are one of the very lucky few and you are on borrowed time.
If you are not prepared to pay the fine, dont do the crime. However petty it may be.
At the same time, I also feel that operations like the one being discussed here are a blatant top up of the bank balance.
As has been said, i think that the wee sign showing your speed and a smiley or sad face is more effective and i'm sure there are statistics out there to back that up. The only problem with that is that the Govt cant make a penny from a sad face. Unless its one of your coupon at the wheel...