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No, not kidding.
Not ALL depreciate . Look at some of the vintage loops, V7 Sports, 750S, 1000S...Only most new ones. Nobody has that magic crystal ball.
To become expensive something has to not only be rare, it had to be WANTED, the larger the audience the better.
1 of only 50 guzzis made is pretty rare. I'm not sure how many duc Mike Hailwood replicas were built, but then again that was a very very special bike, in a different league than the green guzzi