Yes, there should be 2 modes of operation. One for authoring and one for consumers. This link looks like it's authoring because it has the markdown on the left. Viewing mode presumably wouldn't let me edit the markdown at all. In that mode, letting me tinker with the numbers and not have them save might be helpful. But I'd go one step further and add a "Make a copy" button under the sheet which exports the data into Google Sheets or downloads an CSV.