"Keeping the harmony doesn't come cheap." Twilight just didn't expect the saying to be THAT literal. Or monetary. On the bright side, she now knows to never trust her friends with money again.
Equestria's newest Hearth's Warming craze is the gift clock: a new present every day for the entire moon. It's perfectly natural for the Bearers to try a few out! And it's not as if the riot was completely their fault!