I get the cost, but If you can swing it I see nothing wrong with spending more then the car is worth. Sometimes its not about the cost, its about the hobby.
I have owned my 74 since 91, it was a father / son project (more father than son), I drove it in high school., I spent a great summer getting to know my dad as we toured hells half acre hitting all the local shows, and taking home a bunch of trophies. I have been fortunate enough to keep it all these years, although a great many of them it was put away in storage.
The car is part of my life and will be for as long as I am able to drive it.
It will never be a high dollar car. It is in need of, maybe not a full restoration, but very close to it and I would like to take the time to do it right, so it lasts the next 20 years. If I do, I would like spend more than the car is worth, but it would be worth it, because of the sentimental value of the car. I wonder if its the same for the demon guy?