PS - when sellers refer to price it is always without shipping, but buyers like to consider shipping as part of the price
I would counter that sellers tend to talk about the price, whereas buyers tend to talk about the cost.
All anyone cares about is the net change in the balance of their account when it is all over.
Since I have done nearly as much selling as I have buying, I have come to feel that it is my responsibility, as a seller, to pack an item well and hand it off to "somebody" for delivery.
Whatever costs and risks occur after it leaves my hands are the responsibility of the buyer. Ownership of the item changed hands when it crossed the counter at the shipper's.
If you buy a keyboard from me, it is not my responsibility to ensure that it arrives safely in your hands, it is my responsibility to send it on its way to the best of my ability.
At least that is my opinion. It has been my observation that 2%-5% of online transactions fail for whatever reasons, and those failures are often not the fault of either seller or buyer.
