I include postage ( free post) in some items, no big conspiracy.. they sell. I buy items that have free post as well.

No, it doesn't seem right that US sellers don't pay FVF on the international postage costs but Australian sellers do.  

US: 

However, when you offer an international or one-day shipping service and it's selected by your buyer, your final value fee for shipping is calculated using whichever service is less expensive, either:

• The first domestic service in your listing that isn't one-day, or

• Your international or one-day shipping service