Worth $49 billion in 2007, Mukesh Ambani's fortune has pretty much flat-lined since 2008. Despite lackluster performance, he's held onto top spot for 6 years straight. Regardless Ambani remains bullish; says he plans to invest $25 billion in his businesses over the next 3 years. Amid falling output from his Reliance Industries' KG-D6 offshore oilfield, the government is planning to raise the nation's gas prices, effective April 2014. This upcoming decision, which his oil giant and its partner BP had lobbie