http://en.wikipedia.org/wiki/Richard_Branson Richard Branson 2.6 Billion
In the same league.
Branson is well known for being a shrewd businessman and only looking to enter markets where he thinks he can compete and be financially successful.
Consider his recent investment into Formua 1 racing. Last year he sponsored Brawn GP for the first few races for a paltry sum of money (because they were desperate). Due to the team being sold off by Honda and they came back from the brink and had the fastest car - he got a ton of free PR and decided not to invest more money because he didn't need to.
This year he has created his own F1 team - Virgin Racing, and to save on costs the team are designing the car purely using CFD, whereas every other team are using windtunnels and building scale models and say you can't use CFD alone. Time will tell which one is proven right