I will tell you where this all get a bit crazy, I recently rejected my Golf 8 R-Line which I'd had for just shy of three months. The RRP of the car including extras is £33400 - take off the deposit contribution of £1250 leaves £32150 (there may have been something put in from dealer but cannot find any documents or an order form, but suspect by the amount I was paying, there wasn't.
At the time of rejection I'd made one payment and the settlement figure was £29761. The dealer wanted financial support from VWUK/VWFS to support the rejection - I have no idea what this amount was, could have been anything. For arguments sake lets say they wanted £2k in total, means they valued my car, after turnaround at £27761.
I seen it on their website with 1415 miles on it selling for £32999 which is slightly less than the RRP so not bad compared to some cars quoted on here. I suspect though, the dealer could sell for slightly less as they ultimately have already made £4 on me rejecting it.
I am sure there is much more involved than I make out above, however it is still easy money for the dealer.
I have noticed as well that the car has now sold, despite the dealer knowing about a number of faults on it. They show no shame at all - some poor soul has paid top end money for a car another customer has rejected. That car should be sent back to VW before it is re-sold imo.