Everything in life is a risk, including getting out of bed in the morning. You might fall and break your hip. That said, it appears a seller undertakes the risk of not getting paid if accepting Paypal as payment. The question of the day is how much of a risk is it? In addition, according to the links below, tying Paypal to your bank account may not be a good idea......
http://www.auditmypc.com/pay-pal.asp
http://www.paypalcomplaints.org/paypal-fraud/
And, as if Paypal itself wasn't a problem, how about scammers pretending to be Paypal and taking you for a long ride down a long mountain road.....
http://www.makeuseof.com/tag/how-sca...r-fall-for-it/