Interesting background article, for future reference:
We can start with a simple user question: why would we ever pay for anything that we could get for free? When anyone buys a version of something they could get for free, what are they purchasing?
From my study of the network economy I see roughly eight categories of intangible value that we buy when we pay for something that could be free.
In a real sense, these are eight things that are better than free. Eight uncopyable values. I call them "generatives." A generative value is a quality or attribute that must be generated, grown, cultivated, nurtured. A generative thing can not be copied, cloned, faked, replicated, counterfeited, or reproduced. It is generated uniquely, in place, over time. In the digital arena, generative qualities add value to free copies, and therefore are something that can be sold.
Source: Edge: BETTER THAN FREE By Kevin Kelly. Via Appfrica.