Great post Truth.
I am starting to believe there may not be any conclusive means to prevent, in your words, cheating. Myself, I believe that to be a very small number of people who inflate their average to win tournaments, but I agree it is not right.
I believe SlimShady had a good point in creating more brackets, this coupled with a ranking system would further expose those who pad in order to win tournaments.
I am not a left brain thinker and do not aspire in math, but the ranking system would take a persons average and give let's say 80% value. Take the scores from free tournaments and give a 20% value. If the person withdraws from a tournament a 5% penalty would be imposed on his ranking score. Also a small penalty if a ranked round is not posted in a predetermined amount of time, say once a week.
Only the top 100 in a bracket would be listed. That would give 1/10th point for every place. Same with tournaments. If you are tibbets and are number 1 in average, and finish number 1 in a tournament his ranking number would be 10. If I were number 10 in average and finish number 49 in a tournament, my ranking score would be 8.180. (10th = 9 points (each place in the top 100 is one tenth) x .80; tournament - 49th =4.9 points x .20)
This is just a hodge podge of what I'm trying to express. Someone with average math skills could formulate much better I'm sure, and there are other variables to consider. But I hope you get the drift.
What this would do, I believe, is penalize some of the sandbagging while not penalizing those who play a purer game, and withdrawing from tournaments because of a poor score. It would also give WGT more active tournaments.
As I've said in the past, currently I don't think there is anything wrong with shooting for average. I only play to shoot the best I can on that day, not caring about any standing or what anyone else is shooting. Others play for the community experience, and that's great too. But I whole heartedly agree that to shoot for a lower average for the sake of staying in a lower bracket is asinine. A common sense ranking system, and more brackets closer matched, would alleviate much of these discrepancies. But would not eliminate them all.