When I went to sell my 2011 Honda NT700V, I was amazed. I only had 30,000 miles on a "sport-touring" motorcycle. One guy in California was interested in it...but only if it had less than 5000 miles on it. And otherwise, there wasn't much interest. Why is 30,000 miles high mileage? What part of the word "touring" do people not understand. I wasn't selling a garage queen, but a bike meant for traveling long miles in comfort.
Motorcycles aren't ready for the scrap yard at 5000 miles. Some like the ST1300, the FJR and the Kawasaki C14 have engines larger than some of the cars I've owned. We don't come close to wearing them out, even at 200,000 miles. It's only the rest of the bike that we need concern ourselves with.
I fully expect my BMW F900XR to be my last bike. If it is anything like the F800GT was, it'll run and run and run. The only reason I'd trade it in would be if I got brainwashed by the Marketing folks that I "needed" more. "More" is oftenimes less.
Chris