Dana White is president of the Ultimate Fighting Championship mixed martial arts organization. According to an Oct. 29, 2012 article in the Las Vegas Review-Journal, he was one of the "biggest gamblers" at the Palms Casino Resort, which had an exclusive contract to hold televised UFC events.
According to the article, he was known to leave five-figure tips for the steakhouse wait staff and six-figure tips for dealers. But the day his credit line was cut in half for undisclosed reasons, he pulled all UFC-related events from the hotel and never came back. It doesn't seem like it dampened his enthusiasm for gambling though, as a Nov. 26, 2013 tweet in which he bragged about winning $33,500 attests.