Excuse me? Why are you saying this about Hal?
Because Hal's been predicting that the end of the world is going to happen in a few months for like 30yrs.
Million$ made on the sale of The Late Great Planet Earth made Hal a real estate tycoon - but many also say the book proved he is a false prophet (using the Scriptural test of what constitutes a false prophet, that is). In any event, with media engagements and folks seeking his opinions on everything, ol' Hal is laughing all the way to the bank.