Narcissists are so consumed with projecting an image or facade, they can’t and don’t want or care about anything else. Real money is certainly a good way of looking rich and powerful- but not always the only way. Faking wealth comes with a lot more stress with the terrifying risk of being found out- but it is clear Trump has still used that strategy a lot, and gone to great lengths to hide the fact that his real wealth (although significant) is less than it appears.

Appearing wealthy is especially attractive with narcissism since it is the most banal, obvious, and universally understood signal of success and greatness- but the money itself isn't the goal, and having wealth in secret - as may be necessary if it is under the table - without adding to the appearance of being wealthy would be uninteresting.