That's what, around 6400KM or 4000 miles per year? It's a bike that's been ridden regularly, that's for sure. If possible, see if the seller has any maintenance records. That mileage isn't out of the question at all. However, if the seller wasn't current on maintenance, then you may be looking at putting a few bucks into it. There is regular maintenance required. You'll need to do valve adjustments and throttle body sync's as well as brake maintenance, etc. However, it's not that tough nor spendy. Do you work on bikes yourself, or do you pay someone else to do it? I don't care where you go, that's going to cost $$'s. It's stuff you can do yourself with a manual and some basic tools. Used BMW Oilheads are cheap as chips these days. I'd try to work the seller down to a figure under $5K.