Maybe he just enjoys the tour.
The Travel/ Hanging out with the other guys/ Playing in front of big crowds.
I mean look at Jimmy Conners....had he not continued to play as long as he did we never would have had the magical USO semi final run..that was so historic.
Eventually you don;t count on them winning..but every once in a while you get to see the fire and the champion comes thru.
and players like this make for good early round upsets.