At the risk of sounding as if my ego is a bit large, this is what I've always chalked up my lack of crashing to. It certainly has never been for lack of grossly exceeding the speed limit, taking curves very fast, and a wheelie here and there. However I've always been fairly reluctant to do that which I felt was quite obviously over my limit. I took years and many thousands of miles to increase that limit slowly. In my earlier riding years this meant that my riding was very reserved compared to my sometimes lunatic friends. Nowdays, however, after quite a bit of racetrack experience, it means that I can comfortably ride at a pace that allows a good margin of error yet one they cannot match.
To the uninitiated, which unfortunately includes the police, it might look reckless. Free your mind from such shackles----for it is not. Many things can be dangerous in the hands of the unexperienced and uninformed (some of which, to our dismay, still choose to participate, proving the point.) In comparison to the motorist population at large, I retain more control over my vehicle than all but a tiny handful of like-minded enthusiasts. Rules of the road, for me, have long since faded into silly anachronism, power enforced upon me for it's own sake rather than the safety of anyone around me, or even myself.
Of course I say all this in the wake of my first big crash just a week and a half ago. To my credit, however, this was in practice at a club race, and the crash was the result of fallen oil and a somewhat lately thrown flag, there was little I could do. Even when you know what you're doing, there is a measure of risk. Choosing to push my limits in the right setting helped ensure that I walked away from the 100+mph crash (but now I'm -1 racebike darnit.)