Someone who doesn't sell on eBay would be completely ignorant of the (apparently large) consequences of negative feedback. She gave negative feedback because h

Someone who doesn't sell on eBay would be completely ignorant of the (apparently large) consequences of negative feedback. She gave negative feedback because her experience didn't match her expectations. It's a reasonable thing to do. It doesn't seem reasonable for the company to lose large amounts of transactions due to one negative feedback. But that isn't the buyer's fault, it is how eBay is organized.