Basically his entire staff has business booked up through the next year, and have already said they're pretty sure nothing is going to happen. That makes me wonder whether he himself truly believes any of it or if he's just another con man.
Also, he's made $72 million and counting off of this May 21st rapture claim.
May 21 End of the World: Harold Camping's $72M business - May. 19, 2011
History repeats itself, ect.