but i guess the $$$ raised from cameras has to be spent somehow
Not sure how it works down in Mexico, but in Queensland the Transport Department collects all revenue from police issued tickets. You can't even pay a ticket at a police station. The cops don't see any of the ticket revenue, it goes staight into government coffers. Police are allocated a budget, just like any other government department, by their political masters. The police budget is not based upon number of tickets issued or any other such rubbish.
I think you will find the Victorian state government, like all other states, would be broke without speed ticket revenue. But I don't care, cause I don't speed. More than happy for others to prop up the government on my behalf
KB