Why?
Because they are designed & built with something other than profit in mind!
Honda are designed by computers, built by robots and as bland as tap water.
Suzuki are very capable but fall apart at the first sign of a British winter.
Kawasaki have only recently began making mental sports bikes and as such are the only other make I'd consider owning.
As for the Italians, designed with passion but sadly made from soft cheese and wouldn't survive a British summer.
Triumph are good, but not focussed enough for me.
In my opinion Yamaha are some of the finest bikes to ride & own, combining precision engineering with excitement and good build quality. As stated in a highly reputable British bike mag "The 2004 R1 is one of the most highly developed sports bikes of modern times".
Buy one & enjoy!