I don't know why a credit card cash advance using Paypal wouldn't be allowed? But like they say READ THE FINE PRINT on your card to make sure it's a-okay.
Paypal charges 3% in fees too you need to make sure you add in that amount when figuring out if it is worth it or not to do. If you did it with a 0% balance transfer offer it then would be. Who knows though if enough people do this credit card via Paypal idea it could cause a problem and creditors will start keeping an eye out for it and regulating it. With that said if I were you I wouldn't shout this from your rooftop for your neighbors to do.
[font=Comic Sans MS]Change will not come if we wait for some other person or some other time. We are the ones we've been waiting for. We are the change that we seek.