Bjornsteyn:
NOT ONLY TIGER WOODS!!!!!!!!!! Many golfers do it! : woods, mcilroy, polter! They ALL must stop! You all are small minded people!
I'm still waiting for some positive solution as to how you would enforce it to prevent it from happening within your field of view by a player who has a legitimate reason for doing it.
That question aside, none of us here have addressed the fact that such fines may already be in place and fines are being enforced by the PGA. Such behavior may violate the "Conduct of Players" section of the "PGA Tour Players Handbook". Those enforcement actions are not made public by the Tour.
Fines are levied for profanity; that much is known. Yet players continue to swear on the course and pay the fines. If spitting is not already being fined, your request for fining those who do might not slow it down much. After all, the swearing issue is still prevalent.
It's an older article (2004) but John Feinstein from Golf Digest wrote an article about such conduct enforcement here:
http://sports.espn.go.com/golf/news/story?id=1887352