It seems like most see an investment as solely financial, and always expecting a positive return. I just see it as putting my money into something tangible, and getting SOMETHING back. So I invested in an aluminum single piece drive shaft- I am not expecting to make money off of it or see great FE returns, but I have put money into it a tangible object that does something for me. I don't expect to resell it and make money, although I purchased it for <50% discounted value, but it will continue to help my FE, add value to my car, and worse situation, remove it, sell it, and sell the Mustang with the old DS.
My car has not paid for itself, but what it's allowed me to do, and the hobby, fun, passion, and development/testing with this site has been more than worth the investment