My under 5000km xx9 has cost me about $1.70 per kilometre so far. But that's because I had the thing serviced, changed the belts and the tyres as soon as I got it.
No one here is going to have the same cost per annum for their bike. It depends on the km's covered, the types of tyres used, if any shims have had to be changed and how many, whether it's an R or not, belts are recommended to be changed every two years etcetera. Probably give an estimate on the KM's you'll cover and if you'll do any of the maintenance yourself. xx9's don't have the set service schedule like the 848/1098 and the cost to keep them on the road can be quite variable.
999R 03 #0069
Italjet Dragster 180
Kaw ZX9R C2 fixxerupperer for fun aka The Ginger Ninja