It's not just The Zed, anything that does 20-25 mpg has dropped in value much more than we could have all expected in the last 12 months or so. Look at it this way, the Zed owner who does 10k per annum, averaging 25mpg, is paying about £280 a year more for petrol and prices of Zed's have probably dropped 1.5-2.0k faster than previously so right now they're really good value for money. But yeah, you're right, prices speak for themselves.
Pete