Money has no intrinsic value. There, I invalidated the entire argument.
Money only has importance if a) it is assigned value and b) there are goods it can be exchanged for. If the reason you acquire money is to exchange it for goods, then said goods are already more important than the money you used to acquire them. And you acquired said goods to satisfy some of your needs, such as security, happiness, freedom...
When searching for the most important thing in life, you're not looking for the lowest common denominator. You're looking for the end-all be-all intrinsic value that everyone inherently strives for, whatever that may be. And that is not money; money is always just a tool for you to acquire something else.