My take is that SOPA is about a great deal more than digital goods. The global economy has enormous minor/innocent IP infringement as well as blatant copying. Companies want to circumvent tradition legal approaches to protecting their IP and it looks like they may get it.
Grey market goods? Currently these big companies fight a losing battle trying to secure their distribution to only authorised dealers. I would assume this bill would make it a lot easier for them to get sites they don't want trading their goods shut down.
