In terms of revenue raising, I have seen it happen.
When I worked in the WA Camera section we would see the cameras all of a sudden get switched from main roads where they averaged up to several hundred speeders a shift, to residential streets where they were lucky to get 2 or 3. The reason was openly stated within the section that the amount of money raised by the camera's was a publicly known figure, that the public had a set amount they would tolerate before it became politically dangerous to the government, and when that figure was close the cameras were switched to areas where they would get little or no speeders.
In terms of speeding fines I agree with you, speeding is a choice, if you make that choice you shut up and pay the fine - and if you do not have ability to hold your car to the speed limit you should not be on the road.
In this instance, I am off with being written up while being told that were I a child I would get a warning - that is what angers me about this.
Yes I'm an adult and should know better, and I do know better. I know the road rules and I have the situational awareness that comes from being on the road 26 years, I obey the road rules and I consider myself at much less risk on a push bike than a child. I ride a push bike the same way I rode (before I had to sell it) my motorbike - that is treating every car like it wants to kill me.
The cop asked me why I was riding without a helmet, I told her I was unemployed and riding to try and lose weight for both health reasons and to improve my job prospects.
She could have done the decent thing and given me a warning, instead she wrote me up when she could have shown a little common decency and leniency.
Fair cop I was in the wrong, but what ##### me is the double standards.