How often do those of you who sand your ball do it? Do you judge by the # of games or do you wait until the desired reaction starts to fade.

I wait until either the ball visibly tracks out, or when I feel that it lost reaction. I do not keep book how often I use a ball.

It will take a good couple of games before I consider somw surface work, and normally I do an oil extraction in the bucket prior to any sanding or surface refreshment on the spinner. In most cases, the bucket tour and some good cleaning restores much of the reaction and does not make sanding (= material base reduction!) necessary.
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DizzyFugu - Reporting from Germany
Team X website & more about me
"Put some make-up on your face
 Make this world a better place!"
Kahimi Karie, 'Good morning world'

I usually hit my ball with the recommended Cleaner until the Reaction fades at that point I start using sandpaper to bring back reaction.
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Beware I have the Domination In my Bag So now Its time for me to dominate!