aren't they tens of thousands? I don't think they very often lose value but you do have the problem of authenticating it. I'm also not sure how much you'd lose in fees
I wouldn't be buying any high end products in this financial climate. They rely on a significant quantity of people being able to afford them to maintain their price and I'm pretty sure that number is dwindling as I write.
also, as the financial ads will tell you, past performance is no indicator of future performance. If you have a handbag worth tens, maybe hundreds of thousands of pounds, make sure you have it insured too