Jerry bought the Cowboys for $150 million in 1989 (man, it'll be the twenty year anniversary soon). Anyway, Forbes Magazine thinks he could sell it today for $1.17 billion.
And, for what it's worth, I like Jerry. I don't know what complaints you could possibly have. He spends a ton of money on players. He wants to win. And he doesn't meddle ever since giving The New Jersey Con Man complete control over the team.