Paypal loves bitcoin because they hate CC companies, not necessarily because they think it's cool.
I get it. Paypal hates that credit card companies, by law, have to give consumers rights that PayPal doesn't. Bitcoin makes it easier for Paypal to screw you.
Why does anyone need paypal for anything in a bitcoin transaction? Feedback? Transaction history logs? Why would anyone agree to pay paypal a fee when bitcoin is involved?
A buyer can at least open a dispute with paypal. In case the seller depends on paypal for future sales, he might not take a "To Hell with you" stand.
In case the buyer purchases the digital product directly using bitcoin, he is on his own.