What's frustrating for those of us with online businesses (or any other
business, for that matter) is that the customer, who has no reputation to
uphold, can rant as he or she will, and other people online will actually
listen. Internet rants are on the level of graffiti in terms of commitment.
There's no fact checking possible, yet a lot of people automatically side
with the consumer rather than the business. The situation is inherently
unbalanced, and that's why so many people here attempted to support the vendor.

The original ranter's intentions were not good. He was not trying to save
other listees from making a mistake, even though that's what the title of
his rant implies. There's no altruism here. His intention was not even to
obtain a refund; he could have done that privately. His intention was to
infict damage.