I have never received a ticket. I have sped plenty, but I guess I just get lucky. Usually I try not to go any more than 10 mph over the speed limit just to be safe.
If you're going less than 10 mph over the speed limit, that's not bad at all. Where I live, people routinely drive about 10 mph over the limit, and are rarely issued tickets for that. The only speeding ticket I ever got was for going 94 on the freeway. I'd never had a speeding ticket after several years of driving, but I finally got caught. I learned my lesson, I never go that fast anymore.
I'd say my worst tickets as far as fairness goes would be parking tickets. I understand the laws better now, but they can be pretty confusing when you're new to a city. I think the signs should be more a little more clear, but I guess the burden is on the driver to get it right.