Counter-example: me. I define enough money as not having to worry how to pay rent, bills and food, and being able to do spontaneous purchases without thinking too much about if I can afford it. I'm at that point with my medium-high middle-class income, and I don't want to earn more. I probably wouldn't refuse if it was offered to me, but having more money than I do now would also very likely make me feel very guilty. I don't need more, and I'm already in an incredibly luxurious position that I feel pretty conflicted about because of how much it was all down to luck.

I suspect most of my best friends, who are predominantly about as not-rich-but-comfortable as me, feel similarly. Otherwise we probably wouldn't be such good friends.