it was not posted by you first, but comments like "you don't look at a ball when throwing it" or "you don't look at a bullet" are way too wrong, like pointed already. I was going to mention a soccer or rugby player taking a free kick - they pick their target and look at the ball all the way.I was even offered a job teaching tennis when I was 20 yrs. old [....] I have never actually seen the bat or the tennis racket hit the ball.
Since it came down to baseball and tennis I have several observations. I'm very far from being a decent tennis player but here is what I think.
Look at the line of sight of Roger Federer. He's looking at the contact of the ball and his racket.

Here the contact is already made but his eyes are just in the beginning of transition to the opposite court side.

Finally, here is the shot by Sharapova. Watch she is tracking the ball that approaches her, then all the way she looks at the ball (images 4,5,6-contact), then she continues to follow the ball with her eyes on a "follow-through".

Similarly, when a golf player takes a shot (either a drive or a put) he looks at the ball until contact is made, and only after a follow-through motion he looks at his target (actually he watches the ball approaching the target he set before walking into the shot). Sounds familiar, uh?
what makes you so sure? I know little about how snooker pros aim but it might be not that one-sided like you put.Snooker - 100% OB