mefitz: Rather "camp out on Bethpage and Oakmont" and watch your overall game improve tenfold ;-).
Is it just me who finds Bethpage maybe the easiest of the 6 courses (I refuse to count Cabo)?
To the OP, the reason for the naysayers is that the designers of the game foolishly included absolutely no incentives to get to Legend. Everything gets harder, there are no advantages save some balls that may or may not be imperceptibly better than those anyone can use. You will find yourself in alt shots playing against TMs and hitting a drive 8 yards longer than they did, but you'll find yourself 30 yards behind them on the fairway. Unless, like me, you are a level 87 Legend and you find yourself competing against a level 90 TM that already has better equipment than you are allowed to get, then the disadvantage will be more pronounced. Almost every WGT-sponsored competition you enter, you will find heavy winds. Almost every RG you enter, you will find heavy wind. Occasionally, you will enter an RG, and find championship greens, which you only ever get to 'practice' on at major tourneys.
In short, WGT screwed the pooch with the tiers, actually adding incentive to the sand-baggers. And with all that, I echo many of the sentiments here. Don't hesitate to tier up to Legend, but don't do it playing one course. Play them all, and let your average do what it does. I went for Legend because I try to do the best at anything I attempt. I do not see the sense in attempting things otherwise.
My hope is that someday soon, WGT will realize what horrible decision making on their part went into the tier system as currently in place, and do something to make tier elevation desirous and not just a hinderance. But of late, they seem to be unable to find their @$$ with both hands and a map, as evidenced by the fact that the Bouvet Island faction is still playing Unlimiteds, so I am not holding my breath.
I have sent them e-mails illustrating how it is directly due to WGT's errors that we have the sand-baggers and multi-accounters. As yet, they have not made the changes needed to fix the system. Not sure what they are waiting for, but their reticence is driving a lot of good players who have invested a lot of money with them away.