Should I focus on content quality or pageviews?

If your main revenue stream is ads, you’ll optimize for page views, namely ad inventory. You’ll find that many levers are more important than content quality, such as titles, populist subjects appropriate for social sharing, and page-maximizing formats such as slide shows. But if your main revenue stream is paid subscriptions, then quality — the key determinant of willingness to pay — comes first.

David Jackson in Measurement is the key to success for content businesses; but measurement of what?