Your point about paypal is of course correct.<p>Importantly though in this case the buyer knew the price was to good to be true and his greed got the best of him. Plus the thing to keep in mind is the level to which a company like paypal can protect against fraud.  Might be similar to expecting that a dry cleaner should detect a forged clothing ticket perhaps. Or a restaurant should detect that another diner is using your reservation. Doesn&#x27;t scale very well.