I don't understand how anyone can believe Rossi.

He has a mysterious device. He refuses to submit it to tests where anyone but him gets to measure the sytem's energy inputs and outputs. It hasn't been properly evaluated by third parties. He makes wild claims about both the product and how well it's selling. AND he has a history of this if you read about his previous ventures.

It has every hallmark of a con. At this point I'm genuinely interested - how can you believe it?