Exporting and Sharing Dashboards

I am the admin for our application and have created many reports and dashboards. All of my users can export these files if they desire. However, if any user creates a dashboard, they do not have an option to export. In terms of sharing, they can only share to the whole database group. If they just build their own report though, these problems do not exist as they can share at the individual level and can export. Why is there a difference for the dashboards?