GlassJaw
Hero
Yup. Frustrated enough that a good proportion of you will actually sign up for Dungeonscape in order to acquire it in some form and fashion. Some of you won't, sure. But some of you will. And the money that comes in monthly from those of you who do through that digital distribution means more to them than a one-time payment for a PDF from the rest of you.
A steady stream of known monthly income matters.
Very true, but it's a HUGE burden on WotC to design, develop and maintain (which they are most certainly outsourcing). WotC doesn't have a good track record when it comes to digital products and services. The margin for error for launching services like these this days is very slim. First impressions and all.
On top of that, a monthly subscription to get access to digital PDFs will immediately remove customers. The feeling of "renting" content has also proven to be frowned upon by customers.