Of all the things that you could do in Cape Town, chartering a yacht must be one of the most luxurious experiences. I guess something even more luxurious would be to charter a yacht overnight and invite a few friends for a party while moored off Clifton 4th beach.
I'm not sure of the name of the vessel in this photo, but while trying to find out, I discovered that the large boat in the photo in this previous post appears to be the Princess Emma, one of the most luxurious charters available at the Cape Town Waterfront.
Given the overnight rate of approximately R40 000, I assume that it would most often be companies that would charter the vessel to either treat their employees (most likely the directors ;) ), or to impress prospective clients. Nevertheless, if you have a mere R40 000 to spend on a night's entertainment, and if you'd like to be super-popular with your friends, this sure is the way to go. :D