Some girl on another question didn't even actually answer my question, but just asked me a question intead. I marked it for spam... but seriously this happens quite a lot. Why answer a question which you don't have an actual answer to?
It's kind of like the old "what's the sound of one hand clapping?" riddle; some people just like the sound of their own voice, or in this case their internet voice of nonsense and babble, despite how completely one-sided, unhelpful, inept, or useless it may be.
Oh and the free points, that contribute towards gift cards, which help people get free stuff. That too.
Maybe the non answerer who answers is wondering the same thing you are or needs more clarification on what you're asking, or is just trying to answer questions for the heck of it and yours she couldn't find a good answer for. Or laziness. Just to say, hey look there's me answering a question.