Originally posted by lavascript To answer the original question, as it was asked, it depends on the circumstances.
Is it ethical to purchase a camera, use it, look at pics, not like how they are coming out, and return it? Yes.
Is it ethical to purchase a camera, use it, decide that it's not the massive improvement over your old camera that you thought it would be, change your mind, and return it? Yes.
Is it ethical to purchase a camera, use it for a wedding or other event, love the pics, and return it? No.
To me, ethics go hand in hand with intent.
It is not ethical in the far east, the purchaser has to bear some responsibilities either pay restocking charge or other reasons such as defective before the item can be returned. The reseller can not take the item back after it has been used for a few days and put it back on sale as a brand new item.