I would like to see some of the lessons we have learnt about Freemium applied to news.
First you have a base level of great content available for free for everybody. You build a very large user base. Then for those people who want to dig deeper, you have premium content. Those users who really value your service won't mind spending a little money to engage more. Those who engage a lot - pay a lot, but it's their hobby, their past time. they don't mind.
It sound horrible when you spell it out explicitly, but like everything you need present well.
10c to read an article 1 hour earlier than everybody else. 10c to comment on an article. 5c to read the full transcripts of interviews. 10c to download full res photos. 5c to read full bio's of the people involved in the article.
You could spend $20 a day interacting / socialising / enjoying your news and entertainment.