Can't chargeback paypal doesn't allow disputes for virtual goods.
Now that is funny. Where have you been? What planet are you from?
It's true, paypal officially doesn't get involved/accept disputes over virtual items. If you paid for something like an online game account or bitcoins and get ripped off, they won't accept your chargeback. Only way would be to claim it was unauthorised.
Before you spout off "official" nonsense just spend 10 minutes searching this forum for the key word "PayPal" and you will find dozens of cases where your pal PayPal has done, allowed, and sided with someone who charged back
after receiving Bitcoins in both physical and virtual form.
I myself sold BTC for PayPal only to have the USD I received taken back out of my account when PayPal froze the account of the guy who bought my BTC. Luckily for me after a two month investigation PayPal did did finally give the poor buyer back all his (and my) USD and I did finally get my BTC back but only because the guy I sold the BTC to was honest and paid everyone back.
PayPal always sides with the consumer and against the vendor in any dispute. Then the vendor (seller of the BTC) is screwed.