In my experience, some users (not necessarily new ones) tend to post a question, get an answer they are satisfied with (as evidenced, typically, by their leaving a comment that include a "thank you"), but never accept any answer to their question.
This behaviour results, not only in lost reputation for answerers, but also in a non-negligible clutter of artificially unanswered question in the "unanswered" section of the site.
How could this behaviour be discouraged?
Could and should the system identify such users temporarily ban from asking a new question until they mark more of their questions as answered?
accept rate
is a red light alert on their account and community always notices everything so it takes care of it withpolite warning comments
atbiglist
tag meta TeX.SX`. One need to be impartial rather than prejudgemental. After TeX knowledge sharing/improving matters most, not rep not brand as they follows with TeX experience.