I will be verifying people and will not accept payment from someone without good reputation, that should be pretty logic. and if I get 10 chargebacks in row, that's pretty much 180 day block guaranted due to "paypal launder policy".
Buying your PayPal cash for bitcoins. Bitcoins will be send within 30-60 minutes after receiving payment. I exchange at mtgox or intersango rate. Only doing big deals because of chargeback risk. Prefer getting 1 chargeback and deal with it instead of 10 small chargeback and get myself locked.