Here are some very expensive bikes, NCR, the Ducati mod company, has several. The list also includes the notorious Dodge 'Tomahawk' replica which obviously is 'capable of near-400 mph!' :rofl_200:
http://autogia.com/gallery/6234/what-are-the-most-expensive-motorcycles
They also don't name only new bikes, which leaves this list suspect, because if you just considered 'what is the most anyone ever-paid for a bike,' or, 'what would it take to make the owner part with this particular bike,' you would have to include some famous racing-heritage machines and bikes owned by famous people, such-as the Brough Superiors owned by TE Lawrence and the Rollie Free Vincent Black Lightning.
http://autogia.com/gallery/6234/what-are-the-most-expensive-motorcycles
They also don't name only new bikes, which leaves this list suspect, because if you just considered 'what is the most anyone ever-paid for a bike,' or, 'what would it take to make the owner part with this particular bike,' you would have to include some famous racing-heritage machines and bikes owned by famous people, such-as the Brough Superiors owned by TE Lawrence and the Rollie Free Vincent Black Lightning.