I remember years ago, at this lunch counter in Naptown where I eat all the time, I asked one of the waitresses what it meant to be rich (this was after a discussion at the counter involving several men who all have quite a lot more in the bank than I do). She said "being able to take more than one vacation a year means you're rich".
That statement sticks with me, for some reason. Because the idea of possessions, and the implication of wealth, or the lack of it, is completely an abstraction, it is alway open to interpretation- it stays relative. My guess is that the guy who can afford a 525' yacht thinks of money in a way that we can't even guess about; a thousand dollars to someone like that would be like pocket change to me. Maybe the idea of a 525' yacht is just because you can do it. I think what annoys me about it is spending that kind of money on new construction when (IMHO) what needs to be saved is old construction. But, of course, it's easy for me to say that; it's not my 300 million dollars.
As for where you would pump it out, it probably has sewage treatment systems on it, like ocean liners do, so what they pump out is (allegedly) germ free. Not that I believe that for one second.