Besides "I liked this!", I picked "I like clicking buttons" because while that's definitely not anywhere near the main reason why I'd kudos a story, it is kind of a factor. You finally reach the bottom of the page, and there's this button that you can click in a "YES FINISH LINE I READ THIS ALL THE WAY THROUGH HURRAY FOR YOU AND ME" kind of way... It's like a victory celebration? Of sorts? All right, I don't know how to explain why, but I just really like clicking a button at the end.