If your appetite for money is insatiable, it's eventually going to catch up with you. Bernie Madoff is a great example of someone who was very successful in his career before the fraud. Having some idea of enough money does not mean that you have no aspirations for more. The concept of enough just means that you pay attention to the idea if your expectations are growing just as much or faster than your income.
There are only a handful of financial rules, ideas, and observations that really move the needle -- and explain the majority of what you need to know to do better with your money.
I could have narrowed this down to 10, but I had fun with this thought experiment, so here are my top 30 rules of the money game.