Actually it says it was withdrawn owing to being 'lost or broken', so it isn't clear that it has been sold. An offer of £140 was declined.
However good it may be in our terms, I personally don't think it has a market value of much more than £140. It's conventional to say that it's worth what somebody will pay, but on the other hand if the seller would rather keep it than sell for £140, maybe it's worth more to him than to the market.
Do you mean the cinder cone? I reckon that would go at 225. I think we're all very lucky to get these bikes as cheap as we do when you consider what you can get new.