I think the market for used cars is a bit volatile atm .. some cars are still on the rise.. some are falling. But I must admit there are bit more examples to choose from, compared to six months back, sadly this doesn't apply to the GSF..
Example :Like the GSF, Audi S8plus is a rare beast, only 73 registered in UK , there were 3 for sale on auto trader in Oct last year and now there are 8, they are all after crazy money.