Let me set a few things straight here:
1) This method is NOT Merchant's private property. I've seen the method he outlines posted for free on several other websites and even (in a much simpler form that won't work well) on here. I was using this method long before the Grand Exchange came out and long before balanced trading--- back in the days when trades stood around Varrock's West Bank or in Falador Park (on World 2). Probably thousands of others were doing the same thing then. The reason that most probably don't do it now is because they don't know that it still works if it's done correctly.
2) The method, as it's outlined and suggested, won't work unless some modifcations are made to it. I could write a MUCH better version of this method than Merchant did, one that would include a lot of market-based strategy. Also, mine would be free.
3) Merchant doesn't exactly deserve to be protected here. He's said, over and over, that he was only going to sell ten copies. If you go through his thread, you can find from 15-20 people who he's sold it to or which it has been alluded that he sold it to them, plus more that have paid for but haven't gotten the guide. That doesn't count the many who may have bought it "underground".
4) I've already bought this guide again from somebody---the exact same file! -- so it isn't as though it isn't already being distributed, and who knows how many more copies have been passed around.
I have half a mind to post my own Grand Exchange guide for free, which will be an improvement over the others I've seen and which will contain many ideas.