I opened a thread asking the same thing, but in a different way. Just saying.
Anyways, some would say they do what they do because they see that it's the only thing they don't suck at. Others will say it catches attention of the opposite sex. Some will say it's because it's fun, and they enjoy the activity. A few would have deeper meanings to their reasons. I'm one of those 'cuckoos', so some call them.
So I will save you the trouble and give a short answer. I draw because I like to tell stories of unknown folk and mysterious places through the use of visuals rather than words. It has always been a lifelong dream of mine.
Wait... What were we talking about?