Excellent question. Some questions are so lame, nonsensical, or repititious, that it's hard to understand why anyone would answer them. That said, I still answer stupid questions at times because I'm bored but too tired to think of a good answer to the better questions. Stupid questions are sometimes a lot easier to answer and they serve my need for some kind of interaction with someone.
Stupid people need the most attention...
I usually don't, if I'm bored I will though. A stupid question is a matter of opinion, I might find a question stupid that you think isn't stupid.
Some times I don't even know why...
I don't want you feeling left out.
like this one? It's fun
I am that bored