
He got way more out of the deal than the $ he gets back for his shares of the team. He had like 10 straight concerts at Barclays and opened a 40/40 Club there. And those are just the things we know he got paid for. Who knows what else he got money for. On top of that, he was able to add to his legacy and build his brand up as an owner of an NBA team.
You're wrong about why he's selling too. He's doing it so he can sign NBA players to the Sports Management wing of his Roc Nation company.

If you checked my post earlier, I said a positive was he was able to get a 40/40 club in the Barclays. Jayz was playing concerts at Madison Square Garden, he didn't need to be an "owner" to get concerts, he's concerts are more to do with Roc Nation. If he was making so much money being an "owner" with the Nets why sell your portion at a loss?? to take on the risk of being an agent? Why not just stick to being an agent with MLB and the NFL and keep your portion with the Nets? Check out more of your basketball economics with being an NBA owner, it's not as profitable as you would think and owning a 40/40 club is not as profitable as you would think either
Atlantic Citys 40/40 Club Closed Because of Financial Disarray, Not Sandy -- Grub Street Philadelphia
And the New York club had many violations so was forced to go through a 10 Million dollars re-launch
You Jayz stans act like this niggga never loses in life, stop it. There was no "brand building" with being the owner of the nets.
Added to his legacy....

Most of his stuff comes from the Roc Nation deal.
He put in 1 Million dollar and came out with 350K
As Mark Cuban said the money in owning a NBA franchise comes from the appreciation of the value of the franchise, not the year to year operations.