Humans are easy to fool. I remember just after the year 2000 I was able to spend the afternoon answering questions and engaging in conversations on the Ranch. While I have not been able to do so for a while, our own site monitoring shows that the traffic is far greater than that period. Hence I am forced to conclude that the site is busy but not always in the areas that I peruse or in areas of my personal interest.
I find a *lot* of comments mentioning that they're amazed at how quickly things are answered: we're blessed that we have people from all around the world, across timezones, answering questions at various times of the day, generally within hours.
Questions that remain unanswered may be things that readers simply don't know, or don't have time to answer, or are asked in a way that makes it impossible or undesirable to answer.