My Kingpin had 28K when I bought it, it was a 2004 so about 3500 a year. I have put about 8K over the last year. I did have to replace the belt, at about 34K, from what I have read that is not the norm. Probably a good idea to figure that into your cost though, about $250 to $500, depending on if you do it yourself or pay someone. That is the only major expense so far, I will need to get tires soon.
2013 Vision Sunset Red - Stage 1 exhaust, VictoryHID Cyclops
2004 Kingpin - Traded