it seems to me. Maybe the credit problem, but I think people are a bit more discerning about how they spend. That's why I have been looking for a boat for so long - many good used boats I have considered are very close to the price of a new one, but without the warranties. Some time back, you coudn't get a Botnia Targa for love nor money, yesterday I found a dozen for sale, albeit some of them very expensive. However, five or six (including 31's) were price at around £60k.
I know people think their boats are worth more than they are, I did (perhaps because they are kept very well). The truth is, age has its toll, and unless you have a boat that everyone wants, you probably have to take it into account.
Take off the VAT (which is only on a new boat), and a % for each year. It might give you a figure you don't like, but....
There is (was) very good condition (it seems to me) Cougar R8 Sport for sale here, 2003 at £35950. A 2008 model is being sold by Cougar (NZ) for 40k euros (£34,188). You figure it out.