Not money, but principle.

When someone tells you, "It's not money, it's a matter of principle," it's all about money.
According to the general saying, money is the yardstick of value, the medium of exchange, the storage of wealth. But it ignores the other side of the story, its intoxicating, maddening, exciting side, and aside from the psychology of loving money. Marx said that money is "the centrifugal force of human feelings", that is to say this aspect.
With regard to the essence, function and merits of money, people have left countless incisive maxims and witty remarks. We often see people excited about money, trying to make money, teasing themselves with the picture of wealth. The impact of money on the Order of the world and in our lives is immense and extensive, and sometimes it is latent, and we often do not realize that its role is so great, yet it is wonderfully true that it is entirely human-created. The driving force of getting rich is not a biological necessity, nor is there any similar phenomenon in animal life. It does not conform to basic goals and does not meet fundamental needs--indeed, the definition of "riches" is to get something more than you need. Yet this seemingly aimless drive is the most powerful force in human beings, and human beings are hurting each other for money, far more than any other reason.

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