News sites that offer paid subscriptions, in the main, still show ads to paying users, in much the same way that when you subscribe to a print newspaper or magazine it shows up with ads in it as well.
The reason is the same as in print: ad revenues generally bring in much more than subscriptions do. Here's some data for the newspaper business, for instance: http://ajr.org/2014/02/27/big-shift-reliance-reader-payments... You can see how even with the collapse of newspaper advertising over the last decade, ad revenue is still generally somewhere from 50-70% of overall revenue. So ad revenue is critical, even for subscription pubs.
This is even more true online, because if you make your publication ad-free for subscription users, you're cutting the ads off from the eyeballs the advertisers want most -- the eyeballs of engaged, frequent readers/viewers/whatever, since those are the very people who care enough to buy subscriptions. So doing so drives down the overall value of advertising in your publication.
The reason is the same as in print: ad revenues generally bring in much more than subscriptions do. Here's some data for the newspaper business, for instance: http://ajr.org/2014/02/27/big-shift-reliance-reader-payments... You can see how even with the collapse of newspaper advertising over the last decade, ad revenue is still generally somewhere from 50-70% of overall revenue. So ad revenue is critical, even for subscription pubs.
This is even more true online, because if you make your publication ad-free for subscription users, you're cutting the ads off from the eyeballs the advertisers want most -- the eyeballs of engaged, frequent readers/viewers/whatever, since those are the very people who care enough to buy subscriptions. So doing so drives down the overall value of advertising in your publication.