The great thing about money — a concept up there with the wheel, indoor plumbing, and coffee in the development of human civilization — is that can be converted. It can be changed, exchanged, used for trade, banked for later use: it's endlessly flexible.
And you can also do some pretty sweet stuff with it, like use it to buy a 427 Cobra or spend it on a vacation or invest it in the hopes that your acquisition will become more valuable and you'll end up with even more than you started. (Ask Ray about his Apple stock.) Wonderful, wonderful stuff.
Doesn't always work that way, though.
Sometimes what you buy doesn't keep its value. Sometimes you get outright robbed. And sometimes you eventually figure out that you did something sort of dumb, and you really should have gone with the one your soul wanted and not the one that was $200 cheaper. Gotta listen to your intuition, gotta have a feel for the collective unconscious. It knows.