Repsol Yamaha Honda?

I can understand people re-painting their bikes to look sportier and stuff. But why would any one want to change the colours to some other brand. In case of bikes like Bajaj, I can understand people wanting to write Honda or Ducati on their Pulsars. But why would one paint an R15, a Yamaha bike, into a Honda one? Here are the images of the R15 which has been re-painted into a Repsol Honda!
(Pictures have been taking from the web)