This is because Paypal doesn't allow in their terms curency trading operations and they have considered BTC as an eCurrency also you can have problems with chargebacks so that's why there is no easy way to buy BTC using paypal.
you can always start a thread here as some people is willing to accept paypal but usually with larger fees or sending as a gift (so you can not chargeback) there is also a peer to peer marketplace https://bitmarket.eu/ that allows you to find sellers or buyers, they scrow the BTC transaction but you have to manage the usual currency transaction (you can pay using local wire, international wire or paypal) and the prices are usually higher than MtgOx that is currently the referency price.
I hope this has helped you but as I said there is no stablished trader using paypal.
Thanks