Gold is always worth its weight in, well, itself. Sometimes, it's worth even more. A gold nugget, weighing 100 troy ounces, sold at auction in Sacremento for $400,000 Wednesday night. "We valued it at around $200,000," said Amy Baker, auction manager for Holabird-Kagin American. "There were 6 to 7 people bidding on it, most of them anonymously. It went to an anonymous (phone) bidder."