They are definitely worth that type of money as regards quality and general rarity, you see them less and less and they are obviously "keepers" with the people who own one, always well-cared for, I've never seen a worn one. I paid 1.550 EURO for mine in Germany in August 2003 and considered that a very good price at the time. Since then almost six years have passed, so I don't consider 2.500 USD outrageous. But 5.500 USD certainly is. This isn't even a rare fin, but the most prevalent one.