Even if CGB gets that low, you should expect to pay a premium because the seller is taking a big risk sending an irrevocable transaction for a reversible one. All it takes is for you to complain and paypal takes the money back and holds it for investigation, if they don't find a blockchain transaction sufficient proof they give you the money back (and this is common because their investigators often don't understand cryptos). So the seller is taking a large risk. Most people will charge extra for taking a risk. For example, look at what price bitcoin is if you want to buy it with paypal...https://localbitcoins.com/instant-bitcoins/