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Here are some thoughts which I felt like sharing on unread support posts.
Having, like several others, been active daily for a few of years answering support questions on the forum, I have seen all sorts of response. Some are grateful for support, a few are easily offended, and a handful either crazy or stupid. That is to be expected. What discourages me from continuing is more that a very large percentage of posts appears to be unread.
Some who post a question will assume they will receive email notification when there is a follow-up. This is not true. The questioner needs to check back for an answer. Since I have made a point of 'mopping up' questions over 12 hours old, and often over 24 hours old, which no one else has answered, the questioners may have given up looking.
I did raise an issue for Webmasters suggesting a 'follow' button, so a question could receive an email notification. My thinking was that of all solutions, this one has to be relatively easy to implement since it this features exists on issue queues. The issue (https://drupal.org/node/2157183) has not received comment since it was raised 15 Dec. 2013.
There are other things which could be done: some other support forums have a button inviting the questioner to accept or reject and answer.
I know that there are not enough people to do everything which is needed in the Drupal community. And I know that the Webmasters are as aware as anyone that there is room for improvement.
To be fair I have benefited form writing support posts. I have received little paid work as a direct result (though like other contributions, writing support posts may give some credibility in the market). Still one learns from the process. Many users have expressed thanks, some with a quick 'thank you' (which is OK), some profusely, and that is nice. A few posts will have been read without acknowledgement (which is also OK).
My guestimate, though I cannot know for sure, based a 'feel' acquired from experience in this work, is that when I specialise (though not exclusively) in answering questions with an average age of 24 hours since posting, something like 40% of my total number of replies are read, and not more than 50%. This means I have worked for (guestimating again) over 1000 hours to give 500 hours value to the Drupal world. This inclines me to think there are better ways to spend that time, either contributing to Drupal in other ways, or whatever else comes along in life to fill that time (I am anyway busy with paid Drupal support work). However, if everyone felt like that, the support forums would die. Maybe it is natural for there to be turnover of those providing answers, just as there is a high turnover of core devs for each version.