I think eBay should implement a system where the sellers list the item price and handling fee for postage, but not the postage cost itself.

eBay calculates and shows the postage cost for the buyer when he sees and buys the item. The buyer will pay the item price and handling fee to the seller, BUT they will pay eBay for the Aus Post label to ship the item, not the seller.

The seller gets the payment notification and a link to the PDF to print the postage label from eBay, and he packs and ships the item using the buyer's postage label.

This will get rid of "postage gouging" by sellers, and buyers will pay the true shipping cost for the item. This will also mean sellers are not considered to be responsible for shipping problems, because sellers just ship using the postage label provided by the buyer.