Newly out-of-work actor Charlie Sheen is making his public fight against his ex-bosses at CBS and Warner Bros. Television about defending his honor, but sources very close to the actor tell me the real reason is the guy is "cash poor" and desperately needs the money to maintain his vast, complicated estate.

"Charlie has earned an enormous amount of money with this show, but he has also spent a fortune and now finds himself in the very tricky position of being cash poor," an insider tells me. "Every penny he has is tied up in property or business dealings."