I just thought about this today. Every time you are transacting with bitcoin, you will be told that you have to wait for bitcoin confirmation. This is common with bitcoin gambling sites. What I know is that bitcoin transactions are irreversible. Then why is it that you have to wait for the confirmation before initiating anything?
I think that before 3 confirmations the transaction is actually reversible.
During the confirmation time you can refund,if there is something wrong with your purchase.
Some people really hate to wait for confirmations and maybe this stops bitcoin growth and mass adoption.