I have an RT, so that would be different. Doing valve adjustments isn't difficult and the only pain in the ass is transmission and air filter changes because bodywork has to come off. $325 for a valve clearance check is one thing, but how much when they actually need adjustment? As far as tires go, I am getting 12k+ from PR3s on my RT. Most of my riding is commuting.
That was $325 for valve check and
radiator flush. I know guys that have had both of these done by the dealer because the radiator flush on the K16 is a PITA.
So far, much like the K12, most people are rarely needing a valve adjust on the K16. On my K12, valves were never out of spec in 80,000 miles. I'm hearing similar stories so far on the k1600 forum from guys with 40,000+ miles that have never needed an adjust on their 16.
I can't say yet for myself, as I just got the bike in January and have 13,000 miles on her.
I do all wrenching myself - except I'll probably bite on my dealer doing the valves and radiator flush. Everything is (as compared to the LT) is a breeze to do. Getting to the air filter takes minutes, instead of an hour or more (on the LT, you had to remove all the Tupperware AND the gas tank). At least with the LT, when you had the tank off for the air filter it was easy to get to the fuel filter to replace, since you were there. No fuel filter on the K16.
Much less Tupperware on the K16 (plus you can leave the lower Tupperware on to do maintenance), and as a bonus: no transmission oil, since the K16 has a wet clutch.