Lifestyles of the broke and famous. Most people can't afford to pay $30k cash for a new car, some of us can, but if your cash makes better interest in the bank then in a vehicle that loses money, depreciates, then finance at the good rates, 0%, 0.9%, even 1.9%.
I f-n hate interest and credit, but credit is important and financing a vehicle is a good way to establish credit history, i.e. make your payments on time kids!!
We paid cash for the tacoma, since it was used, the best rate around at the time was 2.5%-2.9%. So you figure asking $29k for truck, 48 months, around $1800 in interest, insurance is a bit higher on financed vehicles, a hundred or so over 4 years. It wasn't worth it at the time, since the market was sucking and I wasn't pulling much from investments short term. I would have been pretty close, a few hundred difference between financing and cash, but haggled $4k off of price by paying cash, (which isn't always the case, most dealerships want you to finance, they make more money) got the upgraded warranty, and I was happy and no payments and I have the title in hand.
But on the other hand, the wifey's new car, 0% apr, 60 months, why not? Even at 0.9%, your money is better drawing interest in the bank. (Bank of the internet is 1.25% on checking by the way)
Be smart with your $$$ and you can make money where most people throw it away. We manage to make over a thousand a year off of credit card rewards. It takes a little time, but once you learn and have a system, you can make bank if your responsible!