Could you really buy the newly minted coins? You have to contact miners, right? Maybe they have a connection there or something.
considering the fact that there are at least a million bitcoin miners around the globe, they can't just contact "miners" and buy all their bitcoins. but there is still a market for it and miners do sell their coins in there.
also newly mined coins are more expensive than any other bitcoin even though there really isn't any difference the "freshness" of these coins gives them more value. that means it makes even less sense for a service like PayPal to attempt buying these coins when there is much easier and a lot cheaper methods of buying bitcoin.