Because they are rare. Some old Spanish wrecks have been located but recovering the treasure is very expensive because the ship is long gone. The wood rots away and everything is spread out over a big are, then over hundreds of years they can be buried on top of old reefs under ten the twenty feet of sand. Unless you are lucky enough to find one on the beach after a storm, they are hard find. Plus the collector base is broad, so prices tend to go higher and higher!
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