He has no credibility. He could have made a fortune (or at least a good chunk of money) with a tell-all any time in the last five years. But he waited until he was popped for rape and kidnapping. Unless he has some kind of solid evidence (highly unlikely) then only a fool would believe any anecdotal stories he tells.
When did he do the Facebook posts claiming he knew the truth about Obama?
If money is the motivating factor behind talking, he may have thought he would have made more money by threatening Obama than he would ever get by coming forward with a story that nobody but the National Enquirer would ever report.
Is Larry Sinclair rich now?
It is a little funny, though: in 2008 the New York Times didn't know how to pigeon Kagukawa racially:
At Punahou, a preparatory school that had few black students, Keith Kakugawa and Mr. Obama were close friends. They met when Mr. Obama was a freshman and Mr. Kakugawa, who is Japanese-Hawaiian, was a junior. Article