From the NY Times:
They often sandpaper over the names and file off the registry numbers, doing their best to render the boats, and themselves, untraceable. Then they casually ditch the vessels in the middle of busy harbors, beach them at low tide on the banks of creeks or occasionally scuttle them outright.
The bad economy is creating a flotilla of forsaken boats. While there is no national census of abandoned boats, officials in coastal states are worried the problem will only grow worse as unemployment and financial stress continue to rise. Several states are even drafting laws against derelicts and say they are aggressively starting to pursue delinquent owners.
Some are doing it because they can no longer afford the upkeep (mooring fees, maintenance, etc.) and others are doing it to collect on the insurance, as well.
In other yachting news: