Something that Fitzgerald included in his writing was the wide gap between himself and the rich. He was born into a family that had social pretensions but not enough money to live up to that. "In his writing, the rich and the "liberated" were to become symbols of the death of the "old America" in the dawn of an age of moral irresponsibility and mindless selfishness."
When his wife suffered a nervous breakdown, Fitzgerald focused onto his writing more and let that motivate him because he wanted to make more money to pay for his wife's bills. "He worked feverishly at his writing, trying to put his life in order and to earn more than he owed."
"F. Scott Fitzgerald" (Holt, Rinehart & Winston/Holt, Elements of Literature)