Bikram Yoga – The Real Deal Or Just a Lot of Hot Air?

I know that I will always appreciate the benefits of yoga, and I know its practice will be experienced differently by each practitioner; but for now, I think I'll stick to the kind that I'm used to. On considering recent career choices, I was speaking with my yoga teacher about the prospect of learning to teach it. She asked me how much I expected to earn, and then went to say, it won't really be much, 'not unless you're on TV or have a DVD of course'. Maybe Bikram's got something going for him, I just wonder what the exact philosophy behind it is.