I sold a set of mugs in late October. Because they weighed between 500g and 1kg, I used the ebay postage calculator as a 3kg satchel would have been more expensive for those in Victoria, and probably not secure enough for breakable items. I had already listed them at $10 but they didn't sell, so I dropped the price to $7.50 (for 4 brand new mugs!!) And someone bought them from in Victoria. The Ebay postage calculator had calculated the postage to be $11.75 and this is what the buyer paid. I didn't have an appropriate box to pack them so had to make a special trip to Bunnings to find one. Packed the mugs carefully (they were already in a sort of box of their own, but with open sides) with air pillows and packing peanuts, took it to the PO and he said the postage cost would be $14.75 because of the cubing rule (why doesn't the ebay calculator take this into account?). I have had this discrepancy in postage cost happen only about a month ago, and that time (postage was going to be $5 more) I took the parcel home and repacked it. And the inevitable happened - the item (a pasta platter) broke in the post and I had to refund in full to the buyer. So this time, I thought bugger it, I'll pay the extra postage. When I got home and added up the FVF on postage ($1.16) and sale price (74c), plus the Paypal fees (76c), I discovered I had made the grand total of $1.84 profit.