Yeah, I was under the impression that most professional, serious roadracers hunger to be the best in the world, but the AMA confuses me. Either I was wrong, or they got some really, really fat paycheques over there.
It might just come down to American racers not holding the World Championships in the same regard that we do. I mean, in Europe, you're frankly flooded with the stuff, most of the GPs are in Europe so it's kinda like the home of the MotoGP- and WSBK championships. Riders can win in BSB or the European Championship, but they're not recognised as "the best of the best", because a few hundred miles away, in another country (Which is, trust me, a pretty overwhelming concept in countries like America and Australia) some guy just won a WORLD Championship. In America it's like the other side of the world. Why go to Europe to race in the "World Championship of Europe" (I don't mean to generalize about Eurpoe here, I know it's a huge, diverse place, but this is the way it is on the other side of the world)
Did you ever notice that the American greats like Lawson and Schwantz and the rest seem to call thier transition from Domestic racing to the Grand Prix Championship as "Moving to Europe"? That's how it's seen. A good comparison would be the SX "World Championship" Can you understand why all the rounds are held in North America? Dosen't make sense does it? Then why should the roadracing "World Championships" be based in Europe? That's the way they see it, the World Championship isn't in their world (Laguna might as well be in Europe if you live in New York, which is why so many of them complain about having a second GP), so why should they seek world championship glory? Their world is the AMA, and they're racing in their world championship.