I really hate when sellers use excuses like i had to pay for the box, Sticky tape, petrol for my car to get down to the post office etc etc. And what really gets under my skin is that they don't even take the time to place this sorta info in their descriptions.

Sorry i will not pay for you petrol, padded bags, boxs, sticky tape, bubble wrap. If you belive in good customer service you should be supplying these within the postage for free, so you know that your products will arrive safely to your customers.
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So what you are saying is this: if I list an item that cost me $10 to buy I start it .99 cents and sell it for .99 cents.(loss $$9.01) already, you then expect me to post it to you for the price of the envelope even though I have outlayed approx $5 to make sure the item is posted safely. Using your scenario I would be out of business in a week.

Everyone is entitled to charge for the true cost for sending the item which does include packaging (box,bag,envelope,satchel) bubble wrap, sticky tape,stamps,registered post and petrol costs to get to the post office. I actually list this in my description. After being a buyer for 4 years and only just starting as a seller I gave free postage on alot of my items,after a few weeks I was listing at 1/2 the postage cost,I then only charged the price of the stamps unbelievably I did not get 5 dsr's for postage and yet nobody paid any or full price for postage. So no more. I have never left a neg feedback for a seller due to postal costs as I am aware of what the REAL cost is.
When you walk into a physical store do you realise the cost of the item you purchased has already included the over heads,electricity, staff wages,rent etc. Sellers are no different on line and should be able to add a handling fee to cover their expenses in regards to postal costs.BTW state to state postage is entierly different so if the item I sold costs less I pop the difference in with the item when it's posted.