I don't believe it's a case of they don't want to show their delivery. I believe most people want to see the ball reaction more than they want to see Jack Swagger prancing onto the approach, blowing into his thumbhole (while wearing a glove), resetting over and over to get that "perfect rack", then once everything is perfect, utilizing his patented shuffle, stutter, stutter, big plant approach. Followed up by the vertical chicken wing armswing where they proceed to miss 7 boards inside everytime to show you how it "holds".
Just a thought.
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No, you may not handle my balls. Well....maybe just for a little while.