first the last owner mr. starbucks demanded a new arena, an arena that was remodeled only a couple years ago. He and his billions weren't going to pay for this new arena that didn't need to be built. The city and the government are tired of building stadiums instead of investing it into a public transportation system and replacing the viaduct.
Therefore the state said 'no mas' and mr. starbucks threw his double chocolate mocha latte at the mayor and said "I'm selling the team, waaaah". He then sold it to a bunch of cowboys from Oklahoma City (which had been the official home of the New Orleans Hornets because of Hurricane Katrina) who were intent on moving the franchise to Oklahoma City if they couldn't get a new arena. Well of course city hall was like "please pfft" and stuck a spur in the cowboys ass and they now have picked up shop and left.
Then Mr. Starbucks seeing how he will now become the villian of the story, because its his whiney self that caused all of this, tries to buy back the team. This fails, mr. starbucks is tarred and David Stern the commish sides with the cowboys. Thus no "I love this game" in Seattle.