I think its mean that some questions go unanswered. If helping other people and giving our opinons means so much, why are there so many unanswered?
I try to go through the unanswered questions to see if there are any I may be able to help with. Some people like to hang out on the main page and see quetions as they come in, which is also a valid approach. They might miss some of the questions that were posted when they were not online. Also, some of the questions just may be ones that other people don’t know, or the question isn’t worded in a way that makes people want to respond (misspellings, not enough information, written in all caps, etc.) If it bothers you, you should try to go through the unanswered questions and reply to the ones that you can.