I can't believe I hadn't seen this thread before now!
I was just thinking about this today as I have a 1990 Honda Accord with 175,000 miles on it and my Stang. Before May 2011, the Honda was my one and only car. Now it basically sits, and I only use it every now and again when I just feel the need to drive a stick...or have to drive to a shady part of town.
Part of me hates racking up miles on it, but I came to the same conclusion: it's a car. Your car is not an investment. I'm sorry, but it's not. It is a utility and entertainment. If you're not using it, you've wasted your money, IMO.
Now, I would LOVE to be at the point where I have a V6 DD and a Shelby weekend car. I wouldn't want to drive the Shelby every day because I'd probably kill myself or someone else, and I'd want my DD to be an automatic while my weekend car was a stick.
Really, the only thing I want is to have a geared, inefficient as hell, whiplash, manual tranny Stang and a sensible, fuel-sipping, automatic, ATL traffic friendly Stang