Seems you are looking for a cheap R6. You can probably get some $ off the asking for this one but not down to the price you are trying to get for that other R6 (2-2.5K) But this one looked like a pretty clean well taken care of bike when I went and saw it. He also had a 2009 ZX-6R which is what I was interested in and bought.
https://www.kijiji.ca/v-view-details.html?adId=1392673844
IMO he doesn't do that great of a job with the ad as he is missing Ohlins rear shock, brand name rearsets (I think they were Vortex), Ohlins springs in stock front forks. I think sprung for 200lb rider. It was only converted to track recently (last year I believe) and only saw the track twice so most of the 15,000km is street. Full exhaust system with PC V.
For me (track bike) the suspension is usually the first thing I look at as I know at 235lb I need to get it worked on and its usually easier if I start with aftermarket base. If you need to do the same starting with a $2500 bike that needs race fairings, suspension etc you are up to $5000 pretty quick anyhow.
Jeff