Its not that a circle to land is beyond the skill of 99.9% of pilots, its the fact that risks go way up when compared to precision or even straight in npa's. In this day and age there is no need to circle with things like gps and the like. Sure sometimes when terrain is a factor (a mountain on one end of the runway) we have no choice but the weather minimums should be higher so when one is forced to fly the approach the risks are kept close to that of doing a straight in approach and landing. It is not a matter of skill, but a matter of keeping things as safe as we possibly can.
crazy.