Absolutely right Dazza.
I have also noticed a lvl 95 Tour pro, that only seems to play MPC's, he has all the top equipment and seems to win quite a few of these MP matches. I can understand that not everyone will make it to tour master or Legend but if a player is good enough to play challenge matches for credits, surely they are good enough to tier up. Looking at his score history, it seems that he is quite capable of shooting 59's and 60's. (when he does actually play a ranked round)
WGT really needs to work out a formula to include MP results in the tier up process. This guys is quite obviously abusing the flaws in the system and knows that nothing will be done about it, at the same time he is hustling credits away from genuine tour pro's, masters, etc.
Anyway, let's see if anything comes of this....not holding my breathe.