Why do I draw? Hmm...
I'd say I draw just for the sake of it, but I'd also say there's a lot of pride involved, specifically when someone I know compliments me on my art. It's also for the learning experience, I guess. I've never had a real art class before, so basically everything I've learned has been from anime or books and throughout the years I've been drawing I've improved a lot. The experience of watching my progression has really encouraged me to continue and continues to encourage me.
However, I have a tendency to be extremely hard on my own art. Interpret that as a good thing or a bad thing, it helps me remember my mistakes and improve just a little bit the next time I draw something similar.