For special tourneys that are offered to everyone how about setting up the parameters occasionally where everyone has to use the same clubs. By entering a tourney you have access to just a certain set of clubs for those rounds.
As an example, WGT chooses from a number of different full sets (starter, rocketballz, g20's, R11's..etc) that everyone plays with.
I think this levels the playing field a lot more and provides enhanced competition for all.