Afaik, I have awarded and answer to every question and would expect a 100% accept rate.
However, there have been some questions which were so esoteric that they got no replies or where I figured it out for myself before an answer was posted.
Could it be that the accept rate is calculated by # questions asked (ignoring deletions) and # answers awarded?
If so, should it be that way? (I'm not too concerned about my rate in asking how it should be, just genuinely interested in the reasoning)