It's not a question of property damage, this is the great foretold National Security Emergency. We've spent twenty years giving up our privacy for this.

If you want to bring up costs, it's only fair to call into question the damage to the US reputation internationally. Having this type of security threat on a national scale is terrible for trade and strategic relations. I'm a Canadian, I don't trust my closest neighbour right now. That's an entirely incalculable cost.