70% of print ads don’t have a URL!?

Just a quick note on a very curious fact – here is a quote of a recent finding:

I’m working on remake of I Am the Media, so I asked one of our bright and diligent researchers to do a count of the last 4 months of print campaigns on Ads of the World. And the gut feeling was confirmed. 70% of them didn’t contain any URL.

70%? This is absolutely amazing. Out of 256 print ads, only 77 Ads had a URL for more information.

Seems like the other campaigns weren’t really interested in providing further information. But why?