Er, I've heard that's how the Yamakasi does it, but I really don't agree with that. I don't think it's necessary at all.
I've trained with the Yamakasi, and they had beginners jumping lots of big jumps. Yann was having a group of us, some experienced, some not(less than a year), do about an 8 foot drop, repeatedly. Maybe it was different because it was an American seminar, but, food for thought.
The Yamakasi are awesome people. They are incredibly skilled, incredibly knowledgeable, but even more incredibly, they are humble. I mean, the guys played a freakin game of tag with us at the end of the day. I got tagged by Yann. Bahaha.
Anyways, as was said, you don't just join the Yamakasi. It's not a country club. You could probably save up, move, and train with them consistently, sure. And their training methods are indeed awesome. Lots of conditioning, lots of movement. And they seemed to integrate a lot. They demonstrated an understanding of massage therapy, they demonstrated an understanding of nutrition, they demonstrated an understanding of internal energy processes, all kinds of things. Very rounded people, you can really tell they've dedicated to the art, to living it and now to teaching it.