Nah. The fact that a thread has been answered means what exactly? Check out your answers, my answers, anybody's answers for that matter. Sometimes they are right on the button, sometimes they are rubbish. Somethimes they are.....etc. As a ballpark roughly 95% of all posts attract at least one reply and probably 90% get a solution pointer of sorts.

On a forum this active there are really only 3 reasons that a thread goes unanswered:

1. Completely incomprehensible questions "Help! My widget won't whotnot, what do I do?"
2. Really specific Qs where the answer, if it exists, it highly esoteric, and known to few.
3. Sheer bad luck, where luck is proportional to quality of heading, quality of question and finally timing of question.

In my experience many of the repeat questioners have generally been too ?lazy?stupid?impatient to read the (typically useful) answers to their original question. Anonymous Monk gets less help than registered monk gets less help than contriburor known to community registered monk, all other things being equal.