Im just glad that i have a good dealer 5 miles away from me , they are up on the prices these days but more importantly i think is that they dont just buy any old rubbish to punt on like lots do these days .
In 2005 i got a 2001 VW T4 with 80k on the clock for just under 6K all in , which i thought was a steal , sure it had seen some grief down one side but had been well repaired , in 10 years of owning this van it cost me nothing other than service items and a cam belt job , I sold it in 2015 for £1400 with 140k on the clock , which was a steal for the new owner , other than it being PINK

I then went back to the same garage and paid 4800 for my 12 plate Fiorino with 64k on it , since 2015 so far its had 4 injector seals , 4 glow plugs and a clutch kit , sounds bad but as i sort repairs myself its only cost my time and about £250 , probably would have been about 1000 if paying a grease monkey to do it .
The point is unless you have XRay eyes you just dont really know with second hand , it is what it is , a lottery !