There was a guy my dad knew who did a pretty cool thing - he saved up for a new car and paid cash for it, then kept paying the monthly fee (what it would have been) into his savings account. Whenever he wanted a new car, he traded in his current one (which was always fairly new because he bought new ones) and covered the difference with what he had put in his car savings account. So basically he got the freedom to pick up whatever ride he wanted, whenever he wanted, but only had to shell out a monthly payment for the rest of his life instead of coming up with down payments or the full amount over and over again. Really interesting approach. Not the most cost-effective method, but his monthly car payment was basically fixed for life, so he didn't have to worry about that, and if he wanted something new, he could pick something up basically whenever he wanted.
Wow, this is one of the worst ideas I've ever heard.