What do you mean power you have as a seller, Pickles?
If the buyers aren't happy with what they see in your listing, you get no sales. Buyers also can decide not to pay and if it's because you take paypal in my experience they always get their unpaid strike removed.
Feedback on eBay is the equivalent of terrorism, too. Then there's chargebacks.
Buyers are also able to do things like have their computer monitor adjusted wrong so they see the wrong color on their screen and so they buy something from you they think is one color and get something else.
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