I can't quite remember, but don't you get mod points for actions like that. Someone looking to increase their mod level, or boost their points (is it useful on a CV [Resumé]?), might go chasing older questions.

Also, they have a really annoying "community bot" that revives v.old questions into the new question queue... it tricked me a few times, then I started to check it wasn't a community bot question before looking further (pretty moronic and anti-answerer behaviour imo).