Take it for a ride and drive, that is really the only way to know the quality of the ski.
I bought a new untitled 2009 in 2011 (it was in a box that was buried in a warehouse taken from a foreclosed dealer). I pad $9,500 for it then. Due to technology and inflation, your ski would be priced higher than mine comparatively speaking.
That said, I think 9 grand is just a bit high. Yes, the hours are low, but it is four-years old. I think you can find something newer for the same money.
But again, if the ski is in GREAT shape, rides and dives well, and you are happy, the money isn't too far out of line.
You will need to rebuild the SC even though it has only 15 hours. The squirrel cages get brittle with age, break while running, and the parts fall into the engine. It will cost you $450 to get it rebuilt.
Use that as a bargaining chip, get the ski cheaper. I'd shoot for about a grand less...
I bet their price is based on what they paid plus what it actually cost them,,, No matter what the end cost was due to financing, the ski is only worth so much,,,