I'm getting close to 60K on my bike and it's as reliable as it was the first day I bought it. The only regular maintenance I do now is change the oil, replace the chain, and replace the tires. I also have my valves checked once per year but they've never needed to be adjusted. I doubt my bike is worth a dime since it has so many miles, so I've just opted to keep it and maintain it.
Little Rock, AR (previously Raleigh, NC; Morehead City, NC; and Virginia Beach, VA)
2008 Kawasaki Versys
Bought in May 2008 and have 58,000 miles on it as of July 2014