So we make no money there.
Paul Allen put up a small bit of money, that he made back by selling the naming rights for the stadium to QWest. The amount made back in taxes isn't remotely close to the actual cost of the project. They were a status symbol and nothing else. Hell, we're still paying off the bond for the Kingdome, and the replacement stadium actually has FEWER seats than the Kingdome did - it just has more luxury boxes, which Dictator Allen (he's the guy really in charge of Seattle) gets to rent out for $bigbucks.
We did a remodel of the Key Arena less than ten years ago, at the request of the Sonics. Now a new guy buys them, runs them into the ground, then demands a remodel or he'll move the team? Well, fuck you too. We're still paying off the debt from the last remodel...
Look, if they want a government-sponsored stadium, then they can forgo monopoly protection. As long as sports leagues are allowed to keep their exemption from monopoly status and antitrust laws, the government should not be subsidizing them. We've got real issues that need addressing - a neglected highway system, an underfunded educational system, and issues with out of control housing prices and transit that need serious attention now, not some whining nancyboy billionaire who wants to suck us dry for his little toy...