I'm skeptical of the value of advanced martial arts as a practical self-defense tool. The way that, say, muggers operate, I suspect that even Bruce Lee would find himself compelled to hand over his wallet. (You're walking along, and suddenly some guy sneaks up behind you and puts you in a chokehold or something, while another guy, in front of you, demands your money.) Three random guys with baseball bats could probably beat up any single martial arts expert that they got the drop on - and if they have knives or guns...