Shareware Amateurs Vs. Shareware Professionals?

Thanks to an anonymous reader for pointing to a Gamedev.net article called 'Shareware Amateurs Vs. Shareware Professionals'. The article, by shareware game developer Steve Pavlina, starts: "Why is it that some shareware developers seem to be hugely successful in financial terms, growing their sales from scratch to generate tens of thousands of dollars in income, while the vast majority struggle to generate even a handful of sales? The answer can be found by exploring the difference in mindsets between both groups."