Def has to be the recession. Think about it. All the top teams tend to have a strong fan base, sell a lot of tickets, sell a lot of merchandise, and tend to get more TV time. Not to mention they all will be getting playoff money. They have a bit more money and can count on their fan base. The Spurs, Celtics, Lakers, and Cavs will fill up the stadium whether they are #1 or #10.
Whereas you have a team like the Bucs who didn't even want to shell out the dough for Villanueva because they don't have the strongest fan base, they don't always fill up the stadium, and quite frankly no one is running around in Bucs jerseys.
I think Ariza is locked up. Ariza has bounced around a lot, is an LA native, and went to UCLA so I feel he will want to stay with a team who actually has appreciated him. Odom I am worried about. He says he will take less money and loves LA but we will see. This is his last shot at a 'pay day' technically.