> Would take a belt drive first, then shaft, then chain

I don't recall seeing any belt-driven bikes in top-end competition
(or maybe I did, I just didn't know they were)

Superbikes have to be basically show-room models, ie modified
production, and most bikes are chain. Therefore ....

But MotoGP are purpose-built racers. Hmmmm

http://en.wikipedia.org/wiki/Motogp

Didn't see it mentioned there but MotoGP bikes can spin the
tyre on the rim, maybe the same is true for a belt, and a chain
is the best transmission method

The only non-chain bike I ever rode was a shaft-drive BMW.
Quite a different feel and sound to chain. Very high and heavy
bike though, didn't feel safe

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