SDreamily inventive billionaire Bill Joy, the cofounder of Sun Microsystems, has predicted doom for the human race in the pages of Wired. He has a new reason for pessimism: A Manhattan condo he put on the market for $40 million has reportedly sold to Australian actor Hugh Jackman for $21 million — down from a previously rumored sale price of $25 million. The five-bedroom, three-floor condominium has a view of the Hudson River. We have a theory on why Joy sold, even at such a discounted price.It's not like he needs the cash. But we don't think Joy, who joined Kleiner Perkins three years ago, as a partner in the once-storied venture-capital firm which funded Amazon.com and Google, among others, has much time to enjoy the place. Kleiner, like much of the venture-capital business, is struggling, especially with its bets on cleantech which have been battered by both the credit crunch and falling oil prices which make alternative energy sources less profitable. Better to unload it at any price — and invest in real estate closer to the office. As for Jackman, we figure the X-Men star simply knows a bargain when he sees one.