i honestly dont think that is a big enough return for the headache and problems. Unless you already own a car repair shop its just going to be a pain in the *** to make ~30% profit. Plus although the value may be right on those cars, like others have said, not many people will buy a salvaged vehicle.
Now if you were going to double or triple your initial investment then i would say yes, because that amount of money would make it worthwhile and cover any other things that may come up that you dont know about.
Also, what cars?