Lately, [this Electrical Engineering question](https://electronics.stackexchange.com/q/50530/17592) was bumped by the Community user. The question is of December 4, but the asker didn't log in after December 9. 

I wonder if it's useful to bump questions of inactive users (is there an idea behind it?) because these questions most of the time don't get an accepted answer either due to inactivity of the OP, or due to incompleteness of the question.