Can a seller charge petrol, time, fees & other misc costs as part of postage ?????

[jbeach1971]

I have a seller who wants to charge me $29 for postage of a pair of shoes from Vic to Perth WA

I questioned her postage charge and i got back the following

"Yes, the postage is correct. These shoes are pretty heavy, especially with the packaging, and will weigh much more then the standard 500 g to ship. The price is a little higher than the actual postage cost to help cover eBay seller and postage fees, PayPal fees, etc. These shoes are in fantastic condition and cost about $140 when I bought them and I only wore them once or twice."

I only paid $9.99 for them - that was the starting bid and i was the only bidder

I also have another woman who wants to charge me $30 postage for 3 items from Chatswood NSW to Perth and her reponse was

"Yes, the combined postage of all 3 items to Perth will be $30. This includes the increased weight, bigger mailing box, petrol, ebay/paypal fees and time."

Is this correct ??????????????