Yeah, but clubs aren't the difference. Every pro in the event is using top end equipment. There isn't really an edge to be gained through equipment at the pro level. The winner is the one on the top of his game. You don't hear a pro saying that his clubs were the reason he won, do you? And likewise, you don't hear one say that he could have won if he played Callaway irons, for example.
The way I look at it, the pro who gets an equipment contract is being paid to stop shopping. He agrees to stick with the brand, allowing them to focus on keeping his equipment up to date. You don't get an equipment contract unless you're at the peak of the game, and at that point the gear becomes meaningless, aside from mental issues. Pretty much all of the tour level, brand name equipment is among the best. You can customize, but it's not detrimental to your game regardless of what you pick. Any preference at that level is mainly down to mental comfort.
Drivers are also a bad example, since they are a different animal from the rest of the set. They require the R&D money and advertising to stay competitive. I have a Giga driver, however, and I firmly believe that I could win the Masters with it if I had the game. It's not going to snap in half, and using an R11 instead won't make the rest of the field forfeit or add more than a few yards. The irons could do anything GI irons can do, and the woods and hybrids aren't made of a special high MOI nanocrystal that triples ball speed, but neither are the major brands.
Every clubhead except the driver is a chunk of steel. You can temper it, grind it to shape, change the formulation, and add weighting and polymer inserts, granted. But Giga and the other clone manufacturers are using the same types of steel, the same weighting strategies, copying the shape, and machining and tempering it the same way. Just for a quarter of the price. I promise you I could get a set of X22s, put in the same shafts, and my clones would still score the same. All things being equal, I'd love the latest set with a nice brand name. But I can't afford to buy clubs that way, the options of customization are poor, and the clones are a set I can grow into and replace without problems. I doubt I'll win the Masters, but the clubs aren't hurting my chances. More like the fact that I can't break 90...