My take...60 Million is a lot for Ben Wallace. He's not exactly a game changing center, and he really has no offensive game...He is a solid defender, and rebounder. But let's look at the Bulls. They have a lot of Jump shooters, in Hinrich, Gordon, Deng.
ben Wallace stated that one of the reasons he left Detroit is because Flip Saunders offense focused primarily on taking jumpers, and the other players on the court started tkaking longer jumpers. Missed Jumpers on one end, equals easier scoring on the other end, since you don't have much time to set up your defense..