As jwz points out in "The CADT Model," abandoning reported bugs is just telling your users not to bother reporting anything.
Most auto-closed issues in my small team are of the varieties "the PM had a nice idea one day" and "long standing annoyance which we would need to re-architect to solve and we'll get to it one day".
And I don't even necessarily disagree with the CADT post, but... most users are not, for better or worse, so easily dissuaded.