You might find a complete rusty SS396 Chevelle for 8-10k that doesn't run and spent the last 20 years in a barn getting crapped on by pigeons. Can it be restored for another 5-10? No, the paint and bodywork alone will run that if you farm it out. Now you are in to it for nearly $20,000 and all you have is a painted shell. You can find one at an auction already restored for not much more than that.
This arguement makes some people angry. Trust me, I understand.