I reckon you've probably heard of LeBron James, Kobe Bryant and Magic Johnson. How about Mark Walter? The 65-year-old has recently spent US $10b to buy the LA Lakers. It's not his first sport purchase. He owns the LA Dodgers, F1 team Cadillac, a big share of Chelsea. Who is this man? What's his play? How will rise and rise of franchise prices change the sports we love to watch? Featured: Joshua Robinson, sports journalist, Wall Street Journal.