Operators would need to transmit more messages internally to bill for usage across each subscriber and device, and track the aggregate usage in real time.
BlackBerry maker Research In Motion posted some disappointing Q1 growth numbers yesterday, including weaker than expected subscriber growth and device sales.
And, because each new issue would automatically be sent to a subscriber's iPad or other device, the publisher wouldn't have to rely so much on buyers making frequent visits to iTunes.
Another reason is the cost of purchasing the device and plan, which seems likely to be a mismatch with potential subscriber defections from other carriers such as Sprint and T-Mobile.