@tendmote, It's not the "friction" in the transaction that provides the security. It is the intermediary who provides the security. If the actual transaction costs can be less, the intermediary can still be employed to provide the security, but it could then be done at a lower cost. Localbitcoins.com provides a secure service like that, at only 1% cost, not 1.5-3% cost. Or, as I proposed, someone could do it without an intermediary, if they chose to and take on the risks associated with that.
@Jamie, I work with Paypal as a seller, their protection for sellers is lousy. They only protect the buyer for fraudulent payments.
As far as the money being real? There is no "real" money anymore. It's all just a ledger note that says it exists. The money in my checking account is just something that the bank "says" I have, and a private register is kept by them and privately audited for accuracy. Bitcoin is a public register that anyone can audit for accuracy.
And for that matter, a dollar bill is just a piece of fancy paper with intricate printing on it. It only has value because people accept that it has value.