I think the copyright comment is a basic problem with copyright in a digital age.

With copyright as it stands now you *do* have the right to re-sell things you've bought but those things were clasically tangible assets and physical possession passed from one person to another.

With digital works there's no physical transfer and nothing keeping you from deleting your copy once you've received money for it.

Until there's a way to enforce the transfer of goods I don't think it's reasonable to expect content producers to allow you to re-sell what you've bought.