I know they're out there but I'm at the point in my life that I'm happy with 6%-7% steady return without very much risk. But, a diverse portfolio is important. Back to the point of warranties. If the car was Japanese, I wouldn't purchase one. However, being German and being prone to more and higher cost repairs, I would actually purchase one if available (but only backed by BMW). Third party warranty companies tend to go out of business without notice and should, for the most part, be avoided. I consider it peace of mind. Most of the time, things break or give out on a BMW and hopefully, the warranty will cover it. It's all a gamble and if it gives you a little peace of mind, why not? Sometimes it's worth it, sometimes not. A good indy helps a lot!

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'03 Carbon Black M5
'04 Silver X5 4.4
'04 MB SL500