Take it from a con artist. Don't try to sell methods for scamming. That's a scam itself as the previous poster said. Not only that, but nobody is going to buy it without any clear evidence that it works. A simple screenshot of some traded items is hardly any proof at all. I can log on 2 steam accounts and easily make a fake trade with myself.
You want to actually make something out of this? Let me give you some advice and tell you how -
Instead of selling your scam method, give it out to people and make a deal that they pay you at least 15% out of what they make with their scams. You'll make far more than you will trying to sell it, which will work out to about $0.00 by the time you finally decide to give up.