Andrew: you're not a hopester. But what you need to do: really push harder to get your guests to cough up their secrets. You do try. But too many of them end up getting away with answering key questions with vague answers. "Oh, well, we just kept trying and somehow managed to build an customer base." Stuff like that. HOW did that happen? Accident? Happenstance? The guy from Aptimize got away with skimming right past the most important question he could answer: how the hell did he manage to build a business with little or no marketing? His answer was "oh, some SEO and stuff" -- not good enough, not if I'm trying to learn from his experience. The wu-themes guy -- same thing. He "built a community" and then starts charging $100 per theme. Little or no detail about how exactly he built a community -- what specific steps he took -- and what exactly he said and did to get people to cough up $100 for a wordpress theme.
That's been my frustration. It's good to hear these people explain their success, but if you managed to squeeze a bit more detail out of them, I would even consider becoming a Mixergy subscriber.
I don't think anyone has a generic formula for success yet (other wise we would be busy working on it and everyone would be a success story). And in my experience other's people success formula is not going to help me much even if I copy it bit by bit, unless it tune it to my personality/environment/limitations/resources etc.
So I just read these articles (or watch interviews) in the hope of just getting new insights and not looking for a sure way to make millions.