Calculated properties are great to combine different factors e.g. revnue into one distinct data field.
However, it was very unclear to me and the team that leaving a field blank prevents properties from calculating. This should be fixed in one the following ways:
1: Give an error message so the user understands why it doesnt calculate.
2: Calculate the field without the number e.g. when this is a sum.
3: Default to 0 when the field is left blank or ask the user when creating the property what the default should be.