Most users will see it as annoying and superfluous, but many marketing people see it as an opportunity to funnel you through more advertisements, for new products. It's the same logic that has stores like Ikea funnel you through literally every product department, before you can buy that one 'Bjorkefall' candle holder you were looking for.
Sure as hell, but when I go to Ikea, I can just walk through the whole store and not buy anything. When I subscribe to DDI, I'm already paying for a service.
I perfectly understand Ikea's sale model, but I don't like to see it applied to this case. It's ok for non subscribers to end to the generic page telling "this is a snippet of the article, sorry, but to get it, you need to subscribe).
What is missing is a way for me, subscriber, to avoid the annoyance of going throug the same path.
I'm sure WotC has a lot of professional marketing people working for them. I hope thay have taken into account that this marketing model, while may generate revenue by forcing customers through advertisement, also has the side effect of turning away some other which don't want it, because they are already paying for a service.