I've surprisingly never gotten a ticket before. I do go over the speed limit quite a bit, but usually it's by accident. Sometimes I'll go a little over purely because I know my speedo is off. I always set my speed to 105 on cruise control when I'm on the freeway (at a 100km limit) because I know for a fact that it's 100 on the dot.

I think I'm partly lucky but I also know where the cameras are around me...so I go slow around them. xD Never been pulled over and breath tested either.