It really comes down to what they want for their future, legacy, etc. Would you rather take a huge bundle of $$$ and work less, or continue playing on the best circuit in the world and keep grinding to improve, have access to majors, playing in more prestigious events in front of more fans, etc. It would be a tough choice for me, as once you have the $ that these guys have, winning big events/majors and cementing a legacy might trump even more $.Back to Rory, $850m would be tough to pass up. As DJ said, "As a professional golfer, it was a simple choice. I can play half the time and make twice the money no matter the result."
Personally, whether he stays or goes won't affect how much golf I watch or my interest level in any event. There are so many good young players on the tour right now