Cuban made his money when Yahoo bought out his company, broadcast.com.
I think his take was close to 3 billion....with a "B".
I know him to some degree and have close friends who have known him for 25 years....one lived with him for many years and others made a few million working with him.
He is creative and very bright. He's also pretty loyal vs most filthy rich people.
Before the Yahoo bonanza, he also made a ton off of another company (micro solutions) he created in the late 80s.
He did not get rich off of HDTV...it was more of hobby business.
His 1st big move after buying the Mavs was to hire a true basketball man to be his GM/Coach...Don Nelson.
That alone would be a dream scenario for the Cowboys.