Hey friends, My thought!
This is very important to all who knowingly or unknowingly don't select working answer for them question that please select working answer for your question so in future other user can consider if they have similar question instead of asking same question again to the board. Which creates lots confusion.
This is very frustrating for the member who is spending time and effort to help you and asker never select the working answer. Which can result same question asked by many users and may member again have to spend time for the same answer already been posted. Or in some cases asker will never get an answer.
Also before posting a question try to use Search function. Question2Answer has great search function and you should always try to use that before posting your question. As community grow there is high possibility that your question has been answered before from other user.
I hope we all will understand and help to increase the usability.