Contradiction there, people appear to not be willing to pay the current prices, as alot of the cars for sale have been for an extended period, hence why i said that some of them are a little over priced currently.
I think the price of C63 or M3s is very relevant, but perhaps in the oposite way. Entry level for E92 M3s and C63s has reduced considrbaly over the last few years when it appears IS-F prices have stayed strong looking at todays asking prices. Perhaps thats why they aren't shifing.