I think they're pretty fair prices for nice examples, they are retail after all. You could get one for far less if you are lucky enough to find one at a car boot or maybe on the bay, but these are restored and cleaned, and as I say, retail price. You pays your money, you takes your choice. They're not common in Europe still.
The days of a mint fatboy at £30 on the bay are long gone. These things will only appreciate from now on. Grab one while you can, and if like Pompey Bill you already have one, then hang on to it.