You would be surprised how many guys /gals like this look for signs and buy them. And yes, the times have changed. I will admit that I have recently bought some signs that years ago I would have walked away from because of condition.
Clean your sign up as best as you can and enjoy it. You also want to try the old trick of sandwiching the sign between two sheets of plywood and gently drive your car on it to flatten it a bit more.