Also people share articles. If you have a feed there is roughly 0% chance of me sharing one of your articles. If I subscribe to your feed and like the article then I may share it with friends or post to Reddit or Hacker News.
Of course while you may reach some users that you wouldn't have otherwise, you may also lose some ad views from people who would still check your site if there was no feed. So it is a balance.
Of course while you may reach some users that you wouldn't have otherwise, you may also lose some ad views from people who would still check your site if there was no feed. So it is a balance.