I don't want to buy content that can peer back at me.
I certainly wouldn't buy a magazine through an iTunes storefront if I knew that such a sale would result in Apple sharing with the content provider everything they knew about me (which is almost certainly too much but how can I tell?)
The magazine buying experience should be no more entangled than anonymously getting a National Geographic at an airport to pass time. If you choose to subscribe that should mean nothing more than a regularly scheduled money transaction to the content provider.
I don't know why a digital magazine would need to include advertisements specifically managed by the individual magazine content providers. Because that's how things have been done in the paper print days? That is a lame horse-and-buggy argument.
Ad networks for websites manage to deliver globally localized ads without the website content provider having to go in and do anything at all.
Given that these are *digital* magazines, it would be positively retarded for content providers to make the ads static members of the "pages" that would form the content issue. Flip through the pages of any old Nat Geo you might have lying around. How many of those ads are still relevant? The brands may persist but the product-specific ads go stale very fast.
It would make most sense to leave the user in control and make the ads a customizable nuisance you can dial up and down in quantity and personalization and resulting worth to offset the magazine content cost.
The selection and personalization of the optional, and dynamically injected ads, should be performed by a globally operating ad network to ensure the ad content is locally and perpetually relevant. Magazine content providers should be able to tag their content in sufficient detail so that the ads selected by the ad provider can be tactically placed with high relevance (and exposure worth!) to specific articles. This would be similar to how magazine articles reviewing a specific product often have an ad for the same product on the next page. But with a digital magazine, upon later re-reading the original ad might have been replaced with something advertising the newest model, or perhaps a competitor's model.
My point is, there is no reason why the original editorial staff or magazine content providers should have to manage the process of replacing and inserting the digital ads. That should be some org that is above them or serves all the magazines and specializes in this business, and can operate competently in more markets so that magazine content can be translated, localized and resold outside of original target market.
Further, that advertising org should be possible to filter out completely by the premium-paying user so that no ads even enter the picture.
The digital magazine stand user should be able to select which, if any demographic attributes they are willing to (relatively anonymously) expose to the advertising org, and will be rewarded with a higher or lower discount on the magazine issue price depending on how valuable their filtered profile is for those ad networks.