Reason 19. The headline gives a lot of spaces to fill with imagination.
Reason 18. People like yellow color for headlines xD
Reason 17. The headlines never correspond the actual article content.
Reason 15. As a rule of a thumb, they come in as a description to a picture.
Reason 14. I just missed reason 16 and you haven't noticed.
Reason 13. You're now looking to check if reason 14 is true.