What happens is that power sellers and high-volume sellers ship an item, wait to make sure the transaction goes well, and wait for you to give them positive feedback before leaving yours. If you give them negative, they'll do the same to you in revenge, and negative feedback from some guy with 30 points looks a lot less problematic than from someone with several thousand.
When I buy or sell, I wait to make sure that the transaction has been completed (item recieved undamaged and payment not revoked or cancelled) and leave the appropriate feedback.
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