Some just have better teaching skills than others. Doesn't matter if they're famous or not.
Those winning quilts can take 8 hours a day for a whole year! I know I could never do that -- I've got a mortgage to pay.
The "national teachers" are pretty great! But you'll pay bigger bucks to take their classes. Some are the sweetest people you'll ever meet and some are "divas." They're just like the rest of us.