Quoted from The_Gorilla:
the worst thing that could happen is you end up throwing that free pin off of your roof in a strange promotion.
Fling it. Monte Python never flung a pinball
I think there are a lot I might pass on out there. I've seen some with water damage that are beyond salvage or parts value even free - i.e., not even worth the sweat equity.
That being said, I do find I'm on a constant look out in a 400 mile radius for the low ball pins outta ppls garages and sheds that are a day trip away. Many are just trying to get rid of them for either nothing or way too much (emotional attachment). I don't bother trying to argue the emotional attachment - one never wins. I have a couple low priced ones lined up that I plan to visit if only to walk away (perhaps) and see if I can get it gratis. I think many would not pass up the chance to just get rid of a pin - and an old EM especially - that they beleive is beyond salvage.