Alright, I officially think that Charlie Sheen is in on the joke, at least to some extent.
Regardless of what you think is going on here the man seems to be enjoying himself; if he is having a melt down it's about the most productive one in history. He's also keeping millions of people entertained, is working, and may well be laughing all the way to the bank. At the very least he does appear to be, as he put it, winning the internet.
Then again he could just be nuts.