THE top tour professionals make a very nice living for themselves, thank you very much. There is prize money. After the US PGA Championship, Brooks Koepka had pocketed a cool $5,905,127. Not bad before the end of May. And that’s before you add in the club deals and the various sponsorship contracts.Their caddies don’t do too badly either. The going rate is usually 10% of prize money when their player wins. To be fair, these guys deserve every penny they get. If they are lucky, they get to work for a decent human being -witness the relationship between Jordan Spieth and his bagman Michael Greller. They are friends on and off the course and have a brilliant rapport. But for everySpieth and Greller, you will find an employer who blames his caddie for everything that goes wrong on the course. A caddie can only give his player a yardage and highlight wind strength and direction. He can only urge caution when there is a 250-yard carry over a lake to be negotiated.He cannot play the shots.And...