Lets also remember, that despite what Danny says, Memphis did guarantee him more money. They offered him slightly more money annually, but more importantly guaranteed him a third season, which reportedly the C's were not interested in doing. For a guy like Tony, who is constantly injured, and is a microfracture away from being out of the league, that extra $3-5 million is HUGE.
He is not the type of guy who is going to make 40, 50, 100 million in his career. He was able to close to double his previous earnings with this new contract, so even though this money is still hard for us to grasp, it is certainly significant.
So yeah, I am sure he liked the potential of a bigger role in Memphis...but this was a financial decision.