I think there is an issue of rights and freedoms.
With a capitalist economy certain elements of culture are effectively reserved for the wealthy. In other state structures those making the cultural artefacts that we use to express our selves, to link, to coalesce on common sentiment, those could be sufficiently supported to make all cultural artefacts free-gratis and free-libre.
The democratisation of media particularly through availability of music and film - which are so central to our cultural experience - means that many who would otherwise be [partially] excluded from participation in today's culture (for better or worse) can take part.
Moreover, copyright was initially set up with a view to ensuring that eventually the wealth locked up in shared experience, cultural introspection, confrontation with new ideas and different aspects of the culture would be freed in to the public domain.
The actions of media corporations, the use of DRM, these things (amongst others I'm sure) act to prevent entry to the public domain. DRM in particular breaks the copyright deal, if we the people aren't going to get our side of the copyright bargain why should we uphold the side that suits those financial interested in media production? Usually with a contract if one side breaks the terms then the contract is nullified - surely this morally should be true too of copyright.
In short, I think to assume that this is solely an issue of 'people who could pay to consume media choosing not to' is wrong, that there is a greater depth to this and that the likes of TPB have made a change to the access to the culture of the age making it [more] available to those of restricted means. I think this can make for more cohesion in society. Possibly too it makes for more homogeneity, that may not be a good thing however if the principle messages being passed (and shared) in society are those coming from Hollywood.
I feel there's much more to say on this. But I'll stop. /rant
Edit: cleaned up some verbosity.