Likutei Moharan, Part II 64:1/ליקוטי מוהר"ן·תנינא ס״ד:א׳

1We see that the super-wealthy, almost without exception, are real eccentrics. As we observe empirically, anyone who is [super-]wealthy has a great mishegaas .

2Know! the money makes him crazy. This is because the money stems from the fallen wealth of the prophets. For all the prophets were wealthy (Nedarim 38a). When the prophetic spirit came over the prophet, it was as if he was mad. As Rashi explains: “and he prophesied” (1 Samuel 18:10)—he spoke deliriously.

3In the case of the aforementioned super-wealthy, the money creates genuine insanity. Consequently, their wealth makes them eccentric.