Not why you started to study MA's, but why you continue to do so after you have reached an advanced level of skill.

A couple decades ago my answer was simple. I was working in LA as a bouncer and needed all the edge I could get. Prior to that I was fighting on the street. But for the past 15 years I have not been in a physical confrontation where any party was "serious" or angry. So for me the answer is because I have always done it... and I enjoy the training process. Even though I don't like to hurt people or to be hurt.

So, what keeps you going?