This isn't really something that you'll be able to answer in any easy way. Once you're lucky, it is much easier to be "lucky" again. Certainly, it will require

This isn't really something that you'll be able to answer in any easy way. Once you're lucky, it is much easier to be "lucky" again. Certainly, it will require skill on his part; but he'll have a brand and a name, two things that are much more invaluable than any sum of money he may get (although money of course won't hurt either). The brand and the name alone will earn him followers -- lovers, and haters -- who will promote (in their own ways), whatever it is that he's making. It is of course possible that he'll squander it all with some foolish mistakes and show that he was "just lucky", but I'd rather speculate about his success rather than his failure :D Besides, he hasn't even finished this product yet, and you already want him to start working on something new? ;)