I suppose we disagree on what the worth is. I think the worth is making a better social network (which is valuable to Google for a number of reasons), not for being able to better target advertising.
The early days of a social network are critical for setting the tone and Google knows that. They see the comment quality on YouTube and are not proud of it. Do you think YouTube comment quality would increase if it were tied to people's real names? I do.
Anyway, the key point of my piece was this:
"Simply put, a real name is worth more than a fake one."
Do you doubt that?