Had my 24000km (15,000 mile) service done before my long trip south, it cost me $2000 Cdn, 13hrs labor at $120/hr (cdn), all the valves were way out of spec, I thought they might have been, as the bike started to occasionally backfire on de-acceleration, after the service this was cured. Mine is a 2012 base model, it now has 30,000 kms (18,600 miles) on it. I've had no real issues with the bike other than it smoked like hell on startup for the first 5,000kms, and the usual recall work.
I saw my bike during the service and it was fairly heavily stripped own, subframe off, the whole cooling system (rads/hoses etc to get to the front head) mufflers, fuel tank, airbox, injectors, sump. You have to remember its not just a valve job, other stuff gets done as well like new plugs, coolant change, oil/filter, etc....Still it hurts the old pocket book, I used to get my valves done for $350 on my ZX10R.....