Same as speeding tickets. Nobody who knows what's what and has even a little cash to spare gets an actual moving violation out of a speeding ticket for less than a crazy amount over the speed limit, unless somebody in the court system is pissed off at them.
The reason is that a moving violation fucks up your insurance rates and costs a ton of money over time, so it ends up being in everyone's interest to pay a lawyer (takes a cut of what would have been paid in higher insurance rates) to ask their colleague's golfing buddy ("hey, Jim says your short game's getting better!") to accept a plea (less work, hooray!) for a non-moving violation that, gee, would you look at that, just happens to have a fine double what the speeding ticket would have (another cut of the would-have-been-higher-insurance-rates goes here) so sure, the city government and courts are perfectly happy with that arrangement.
The reason is that a moving violation fucks up your insurance rates and costs a ton of money over time, so it ends up being in everyone's interest to pay a lawyer (takes a cut of what would have been paid in higher insurance rates) to ask their colleague's golfing buddy ("hey, Jim says your short game's getting better!") to accept a plea (less work, hooray!) for a non-moving violation that, gee, would you look at that, just happens to have a fine double what the speeding ticket would have (another cut of the would-have-been-higher-insurance-rates goes here) so sure, the city government and courts are perfectly happy with that arrangement.