In a similar thread in this section I've presented a way to get Bitcoins and paying by Paypal. In order to prevent fraud, a PIN code (free) is sent to the customer's mobile phone. It could be interesting for newbies and people needing immediate bitcoins at a premium.
The thread is at https://bitcointalk.org/index.php?topic=38873.0 and so far customers are satisfied
I may be wrong here, however there were times I used to sell on ebay through paypal. From what I got there, the main issue with scammers is not about anonymous guys playing with a bunch of stolen CCs. A person may scam you just because there's an opportunity to do so. He/she could be 100% real, with confirmed address, phone and whatever else. Still if there is a safe and painless way to rollback credit card spendings, many of them will surely go this way. The thread is at https://bitcointalk.org/index.php?topic=38873.0 and so far customers are satisfied
The bottomline as I see it - verifying buyer identity, intention and consciousness could never protect from further chargebacks if there's no legal obsticles for a person to perform it.