Paul Allen is one of those
accidental billionaires of tech and he did it by co-founding Microsoft with Billy G. His philanthropy to date exceeds $800 million but that's not even 1/20th of his net worth. Nevertheless, in 2003 he launched the "Octopus" - the world's largest yacht at 416ft. It cost over $200 million, has a permenant crew of 60, two helicopters, seven boats, and a submarine that can sleep eight for up to two weeks underwater. Now, I don't blame a guy worth that much for spending what is essentially pocket change for a hopping pad on the water, but that's what I call excessive.