The oil companies themselves aren't interested in building...

The oil companies themselves aren't interested in building new refineries and will tend to denigrate the chances of any new investors actually succeeding in their business. They'll say, 'What does Richard Branson know about oil refineries?' He doesn't have to know about that part of the business, but he can easily see that oil refiners are making a margin far superior to what he's making in the airline business.