It's helpful to use an analogy like software operating systems to understand the difference between the free PD stuff and the paid versions. The free stuff is like Linux while the paid stuff is like Windows. Linux might be the way to go if you have lots of time to spare on learning how it works and tweaking to it your needs. OTOH, if you are like most people, paying $150 for an OS like XP looks like a bargain because you just want to get it up and running as quickly as possible so that you can move onto your applications.
While I love Steve's writings, I find that I don't have the time to read it all. Therefore, I don't understand what Steve's "unified theory of PD" is. If he put it all on CDs, sold it for $99 to $199, I'd probably buy it because then I could listen to it in the car or on walks and "get it" within a few hours.
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