Multimillionaire athlete-turned-CEO says he never buys expensive clothes and only flies economy because he’s in constant fear of running out of cash

• With a $1 billion clothing company to his name and having retired from an early career in football and finance, Tom Beahon has arguably made it. Yet, despite his achievements, the millennial cofounder and co-chief of Castore is so scared of running out of money that he never buys expensive clothes or watches and only flies economy. Other successes like Mark Cuban and Keke Palmer, who similarly came from humble beginnings, echo his frugal habits and anxieties. 

The U.K.’s...