The problem is, Barty, that Rossi isn't thinking like someone who is healthy. He has inventor's syndrome. This totally changes someone's perceptions about the world and their motivations. You are absolutely right that he could make a fortune if he would come forward with his technology. However, he doesn't want to make millions or even hundreds of millions. He wants to dominate the industry and make hundreds of billions of dollars. But Rossi is not the first example of someone who has came down with this horrible disease. Patterson is another example. He admitted that if he couldn't dominate the industry he didn't want his technology to emerge at all! Rossi has struggled through great hardships in his life and in his mind this has earned him the right to totally control the LENR market.
I am convinced that multiple versions of his technology did work - not saying that Rossi didn't manipulate the results of certain tests to achieve false results to further his agenda - and that some versions have been replicated. For example, there were multiple teams that saw results from the Ni-LiAlH4 combination. I can't remember all of the names now, but people Songsheng Jiang and others produced excess heat with the combination.
When it comes to the latest systems, they are fundamentally (although structurally different) to devices such as the Pulsed Abnormal Glow Discharge device of Paulo Correa, the Self Generating Discharge Tube of Alexander Chernetsky, the Suncell of Randell Mills, and multiple others. The commonality is that he is using the negative resistance regime to produce a complex space charge or macro-EVO. This is the root of most LENR phenomena and exotic energy systems going back a hundred years. I do NOT claim or suggest that Rossi is completely accurately reporting his energy input vs. output with the QX/SK, but I think it's highly likely that he is getting good results.