That already happened, except Reddit, Facebook, and Hacker News don't pay for the content they aggregate. People dodge paywalls in the comments, and many don't even bother to read the story. What would a paid solution offer over that?

My cool idea would be an aggregator that charges people a subscription fee to participate and read stories. $100/month and extremely heavy (paid) moderation that forces people to engage with the articles. The price point helps get rid of anyone who is unwilling to participate constructively. Revenue-sharing for commenters as well.

Make it the place where real discussions happen. People are social creatures and want to join exclusive clubs.