Well as i mentioned i only asked the question why but seems as though you guys seem to want to spend all your time on the forum rather than riding your bikes, here's another quote you can try to rip to bits.

No production bike has a fly by wire throttle? All throttles are mechanical?A word, a letter and a number, Yamaha R6?

 

If we are to be picky (as some seem to be with my posts) the actual question asked appears to be where can he get one? The title of the thread is anyone make one? And just to clarify before smart people start picking at my last post, the R6 has a small cable that runs into the fairing where it connects to a sensor, which controls the throttle signals. Read the following from the Telegraph.

The throttle looks like any other, with a Bowden cable curving out from the twistgrip and disappearing under the fuel tank, but it's there, hidden away, that it turns to electronic magic.
The cable operates a sensor whose signals are read by the engine management system. This decides exactly what the rider is trying to do from the speed and magnitude of the twistgrip movement, then it operates the throttle butterflies in order to achieve that in the most efficient way.
It sounds like a recipe for detachment and filtering out the feedback so essential to riding a motorcycle fast. But Valentino Rossi seems to manage just fine on his similarly equipped M1 MotoGP bike and as far as I could tell, the new R6 throttle works perfectly.

So as for Rossi cahsing Stoner, he uses a fly by wire throttle. So that answers some questions as to where i get my information from. Next!!! haha