This is interesting. I remember hearing a story about Apple and the record labels. Basically, it took a long time for the labels to trust Apple with their entire catalogues DRM on Apple's servers (DRM was added at time of purchase). It required lots of work on Apple's side to gain that trust so that the labels felt comfortable with Apple essentially housing all of their prized assets.

If Sony was trusting all transactions on the dev network, that seems like they weren't protecting the assets of the movie/TV studios and record labels (not sure if they sell music through the PS Store).

Either way, this seems like a larger shit-storm than just user account details being stolen. It could very well impact future content deals for Sony, and possibly help the other, more trustworthy companies that have demonstrated discipline.