 On to your chocolate bars. They could be worth a lot of money. The cocoa harvest in No. 2 producer Ghana is almost complete, and production is down about 45%. The world's biggest cocoa grower, Ivory Coast, is also seeing a disastrous season. Crops have been hit by bad weather and disease, and the young men who usually work the fields are being lured away to work in illegal gold mines. the wholesale price of chocolate's key ingredient, which has more than doubled since the start of the year,