As I read here
all 8 courts, where the matches will be played, will have Hawk-Eye from next year on.
Hawk-Eye costs between 10.000 and 30.000 $ (every tournament director says something different) and that's really expensive for 8 courts. Do you think thats necessary?
Of course the players are happy about that (in the link above Roddick and Jankovic) and the tournament director Simon says: "It's our aim to get the world's best tournament."
Edit: 3rd option means "I don't care" . Sorry, but I can't correct it any more.