Should point out my Rockets got 126,000 klms on it since purchased new in January 2009. For half that time it was ridden daily .. my only means of transport back then.
As far as maintaining it goes my RIII been looked after better than any other bike I've owned. Factored into my 6 rating was the pisspoor parts situation which doesn't help with all over reliability in my eyes anyway.
Had around the same sort of mileage on both my BMW GS's without any trouble at all .. Harley's only stayed with me for a couple of years before something newer caught my eye.
Having said that I love my Rocket