Think of playing from the back tees as the virtual equivalent of a real-life handicap index.
Making the Legend tier designates you as one of the elite players on WGT. This means you should probably expect to encounter some form of a handicap when playing against those who aren't so elite, in order to create a level playing field (think of Ready-Go's as "net-score" tourneys).
I reckon that if you'd simply start hitting some balls, instead of bitching and moaning about how unfair everything is now that you've become a legend....you'd probably find that your superior skills more than compensate for the extra length of the holes, and you end up beating all those sandbaggers.
Of course, that's assuming you actually have the requisite level of talent to be a legend? Y'know, 'cause it would be fairly silly if you'd played easy courses and tournaments repetitively....simply to lower your average enough to become a legend....without first developing your overall game to the level required of a legend, right?
Just a thought.....
Edit: the above applies to stroke-play rounds only, (ie: RG's and tourneys), not to MPC's. I agree that there's a huge loophole in MPC's for sandbaggers. I'm of the, "play nobody lower than your tier", school of thought.