They mark balls when the player might accidentally move a ball - example being when the player is shooting over a ball. That way they can return the ball to its original location.
Not sure but I suspect the guy marking the balls is like a rack boy from a bygone era - he expects to get a buck tossed his way after the match.
Yeah it kinda seemed that way but I couldn't be sure because a few times I saw balls marked that didn't fit with any of my assumptions as to Why they do it.
I really like this game. Played outside or somewhere humid, hand racked. It makes such an interesting game.
I watched efren and alcano playing rotation in this Challenge of Legends or something and it just wasn't the same. The equipment was too nice, the layouts seemed a lot easier.