I like to think of my car as less an investment sports car and more like a little magnificent Wehrmacht Panzer und Bathtub.
Your right though. Sadly, the 356 Porsches have turned into investments and I dislike that fact immensely. They were fun cars for young guys to drive and learn to work on. Remove 4 nuts form the studs and you can pull the engine out by yourself and drop in a new clutch in a couple of hours. Tuning the carbs is a snap as is installing spark plugs.
Used, the 356's were cheap back when I was a young guy, about the same or less as a new VW Beatle. No one in my family knows what it is, it is seldom driven, because you can't park it anywhere for obvious reasons and it is hidden away. Owning one of the last of the 911 air cooled Porsche cars is a distant goal, but it would also eat you out of house and home as a daily driver. Realistically, the 2016 Honda Civic Sedan Turbo will suffice! It drives safer and better. Also my CU will get me a deal, plus I can drive and park it at the movies or the local rib joint.

John