This is a myth. For the most part, the clubs the pros play are all available to us. Yes, some use "prototypes" that may not yet, or ever, be available, but you can see that a guy like Nick Watney, for example (last year), is playing AP2's. The exact same ones we can buy if we want. http://www.golfdigest.com/golf-equipment/whats-in-my-bag
I agree, though, that they can be a bit deceptive. They know that people want to "be like the pros" but they also want to sell their latest stuff. I noticed this weekend during the myriad of showings of last years TOC that Steve Stricker was playing with a 910D driver based on the big bright shiny head cover. However, if you paid close attention after the head cover came off, his driver wasn't adjustable ... which means it wasn't a 910, it was probably a 2 year old 909 (or older) model. Well, Titleist certainly doesn't want to advertise that a 2 or 4 year old driver is the preference of somebody who has whatever he wants at his disposal, because that would hurt marketing. We're not going to tell you he's playing a 910, because that would be a lie, but we're going to try and hide the fact that he's not.
Same thing happened when the 913 came out too ... some starting playing with it but ALL started using the headcover.
I don't know that I would believe this is the same equipment we can buy, I would have to see complete specs on the clubhead, shaft, ball,etc. I really cannot see that this is the same off the shelf items we can buy at our local golf store and that the equipment is not hand made to their specs and strong suit, especially with all the money on the line for the players and sponsors. Its in my opinion, like believing that race cars are off the dealerships floor and we can walk right in and buy it, looking like the real mc coy dont make it the same. Just consider me like someone from Missouri, the show me state, but what the heck its my opinion and I could be wrong but someone is going to have to show me I'm wrong not just tell me..