The people around him kept telling him this was a good idea. That it was funny and they loved it. What did he expect? They are all yes men and more worried about falling out of favour with him and away from his wallet. This was doomed to failure from the start. No writers, no direction, no real production or planning. Just Charlie scribbling things down on paper and everyone around him telling him how great his is, how funny his material is and how he is "winning".
Where the hell is his family? If I was a relative, I would have had him committed to a psych hold a while ago.