I'm an adviser to the world's richest billionaires -- here are 5 surprising insights about their spending

Getty Images / Matthew Stockman John Mathews is the head of private wealth management and ultra high net worth at UBS, where half of the world's 1,500 billionaires bank. Despite typical stereotypes of the ultrawealthy, Matthews is struck by how "normal" his clients are, and how thoughtful they are with their wealth. The new generation of billionaires in particular is motivated not only by wealth creation but a broader sense of purpose. We are all familiar with the stereotype of the ultrawealthy....