If belts are the shizzle, how come anything 2-wheeled that goes over 160 mph has a chain?

Belts are clean and quite, but so are shaft drives. There isn't isn't anything functionally wrong with a chain.

2002 Bandit 1200/ GSXR cams/ 1277 BB Kit/ Holeshot header and can/ 38mm flatslides/ a good head/lotsa hp/lotsa tq- lots of rear tires...