I looked at the help for the Commerce Setup > Order System > E-mail screen and it shows
... The allowed tags include:
ORDERNUM (The number assigned to this order.)
NAME (The name provided by the customer during checkout.)
STOREID (The unique identifier of the store. This value is also contained in the store’s store.auth file.)
ORDERTOTAL (The complete order total, after taxes, shipping, etc.)
SUBTOTAL (The order total before taxes, shipping, etc.)
So instead of [ORDERVALUE] try [ORDERTOTAL] .
(PS I guess I should read the docs more often.