[nmj]

The anonymity aspects of bitcoin could result in more fraudsters getting away with fraud.

Ignorance creates comments like this. Bitcoin transactions are not reversible, you have zero opportunity for fraud as a buyer.

[jfoster]

Read above. We are discussing a hypothetical system that provides a PayPal-like guarantees layer on top of bitcoin. As you point out, bitcoin transactions are always irreversible. That's what could make it more expensive in my view. The service would always be reimbursing buyers involved in failed transactions at its own expense.