Like Scott said it is a business, most are investments, some I buy to keep personally.. But everything is for sale.. I only sold my Ctsv because someone paid me to much for it and everything has a price.
I know cars and know values and know how to fix them so it's the smartest investment for me. It's not for everyone but it's also not hard to do. Like anything else it's a matter of being at the right place at the right time with the means and knowledge to act upon it.
I urge anyone to find a tdi of this generation with mileage even close. As proven these cars run well into the 200k mark and people still selling them for $6k with 100k more than what mine has on it.