Among the factors considered "is whether the payment service has a substantial historical track record," he said. "I won't say that's the only reason, but I will say that is a factor in evaluating payment services...Google Checkout is, what, a week old?! At this point we're saying it does not meet the factors needed to allow it as an accepted payment."
Google Checkout will likely never become an “accepted payment method” for eBay users. Seeing the rivalry between other Internet companies, this may be something that ends up in the courts.