The system in place is designed so that as you progress through the tiers your level goes up approximately at the same time.
Unfortunately in the distant past there were some very loud complaints from WGT members about sandbaggers. The solution was the present system which means if you play MP against higher tier players your average drops substantially and therefore you climb the tiers quickly. Some players in WGT see their tier as some kind of merit badge and they focus on climbing the tiers, sometimes to the detriment of all other areas of the game. Then of course there are the multis who take this to a new level.
The current situation vis-a-vis club availability is a result of the disengagement of the new average system from the old tier system.
Solution? Easy don't focus on tiering up, focus on improving your game and concentrate on stroke play and your level won't be a worry.
Of course there will occasionally be the prodigiously talented who are just too good for the system, but if that is the case they will get to the top regardless of clubs.