I don't think this is correct, there has been a bunch of owners of 90's having battery degradation issues, I think most informed buyers would prefer an 85 or a 100. I also think that there was/is a lot of buyers who stretched themselves financially to own a an S and the warranty was/is really important to them. There is so much less on a S series that can go wrong as opposed to a S class Merc or a 7 Series BMW. With all of these cars the biggest cost is depreciation and there the S has taken a huge hit over the last 12- 18 months. For a real bargain you can buy a really good well optioned P85D now for $55K (new $120K plus) which is nearly as quick as a new P100D (3.00 vs 3.05sec 0-60mph) and if it has the rare Exec rear seating its an even more luxurious drive.
Thank you Markly, I will add 85 and 100 on my list now. Good info.