Mark Cuban, is especially envious of Elon Musk!
The difference is Musk creates products that improve the wealth and advance the technological excellence of the US (Tesla, Space X for example). Cuban made his wealth in an electronic empire (Five years later, Cuban and a pal, Todd Wagner, created an online streaming audio service called Broadcast.com so they could listen to Hoosiers games in Texas. Yahoo acquired the business in 1999 for $5.7 billion in stock.) that produces nothing that enhances peoples or the country’s well being.