Is this some bizarre fixation on having an audit trail in case you turn out to be Osama bin PantyFanatic?

They'll take cash to buy the scrip which will let you pay the fees, so it can't be one of those "cash shall not sully this transaction" things.

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Calm, quiet, smooth, devastating

Alas, yes. Cash leaves no trail.

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Eudaimonia

Unless you subscribe to the myth that the metallic thread in money can be used like the magnetic strip on credit cards to encode information, act as a tracker and talk to satellites.

This is distinct from the myth that the eye on dollar bills is a printed camera for keeping an eye on the masses.

Marked bills?

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Calm, quiet, smooth, devastating

Yo! Conspiracy Theories Über Alles!

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Eudaimonia