And then you chance buying someone else's problem.

Naah, these film cameras are so inexpensive nowdays that it is well worth an extra $75 to $150 for a complete CLA by a top camera repair person. I actually factor the price in. I am not buying these to speculate and turn them over, I am buying them because I want to experience the thrill of using these wonderful instruments the way they were used when they were new. It is well worth the money and the time. Besides, if I do resell it later I feel much better about myself.

Of course I have had return calls from a few repair shops telling me the cost where I decided that it was better to write it off. But it is hard to make that decision until it has been checked by someone you trust.