I guess the idea is to encourage distribution of the printed copy over the PDF. Advertisers want to see the printed copy in distribution and they're less interested in the PDF being available on the site. One compromise would be to delay the release of the PDF by a little while.
Next deadline is April 13.
To all that are writing stuff for shuffle - remember we're short on illustrations and photos, so if you submit a story, please also make sure you submit some illustrations or photos, it really livens up shuffle.