Look at the amount of people online every day, and then look at how many of them are members.
Now, when a few of those 2000 or so people just don't understand something, it's worth a try to register to ask about it so that they can understand it better. Since... you have to register to post. And this is a pretty big community, so you can probably get your answer, and hopefully pretty quickly.
Unlike some other places, that are dead and have to take a few days to decide whether or not some certain things are spam... ;p