I'm not worried about $30. That's not my point.

I'm just interested if I understood the explanation correctly. Because next time the rate could be different for something else. That's what I'm trying to gauge. Normally I don't fly with a ton of cash.

Honestly I don't normally bring anything into the US in my bags. Anything that's even worth declaring, I probably would have shipped it back and I get a letter in the mail asking me to pay the appropriate duty.