Why no postage to PO boxes? You say you are posting via Australia Post. There is no reason to block PO boxes. That's probably the safest way to post stuff, because a parcel isn't going to be stolen off someone's porch. A large percentage of buyers have a PO box and you could be doing yourself out of a lot more bids by blocking PO boxes. 

Nice to see you have more bids than the previous member mentioned on Tuesday, but I think you could be very disappointed with the end result.