Whilst I have no time for JRM, this line of argument is a load of nonsense. Working in the finance industry, I can assure you that if it were that easy, we'd all be millionaires (spoiler - I'm not!). How exactly do you think he'd 'make a killing'? There are thousands of traders, analysts and algo traders all out there to ensure that any potential gains are hoovered up pretty quickly. I can also assure you that there are very, very few people working in the finance industry who see any potential gains from any Brexit scenario.