Gores isn't selling.
Forbes values the Pistons at $3B and the Pacers at $2.9B. Pacers just sold 15% of their team at a valuation of $3.4B. So you can make a great argument the Pistons are worth $3.5B. Get a bidding war and $4B isn't out of the question.
Gores paid $350M 12 years ago. He 10X his investment in 12 years. 3X in 12 years is damn good, and he did 10.
On top of that, Forbes reports an operating income of $83M. Now that isn't exactly profit, you still have to figure interest, taxes, etc. But they made a profit it appears.
All that great financial news and he did it while being the worst owner in the league in those 12 years. They made all that money without winning a playoff game. Why would you sell? Only way I sell is if I am broke and need the money. Or I have a better investment to put my money into.