On Scrum projects I've had people come up to me and say, "I have no idea what's happening on a project unless I can see hours." My response to that is you can't tell how the team is performing with hours. Is the team more productive when they work 60 hours a week? 30 hours a week?
Story points (relative estimate of effort) show you the improvement of the team… Story points show the velocity and how much a team completed in a sprint.
Here's a story point chart of a team I coached. By using Scrum and Extreme Programming, the team increased its velocity by 391%.