Not necessarily. He is worth millions and he probably has lots of large monthly bills paid automatically by an accountant. The payments may be to a sole proprietor business account which she controls.
Who says the $15,000 is being paid out of his personal funds? Maybe it’s coming out of his campaign funds? Doesn’t he have a charitable foundation? It wouldn’t surprise me if the funds come from there and that is the big scandal. Would also explain how the NE new about the payments.