I recently purchased an M3 ds with a 50mm summitar lens on ebay for $750. The camera was in excellent cosmetic shape and the shutter fired fine except for the slower speeds which indicated that it will need some work (cha-ching).
The lens had some internal fog and the aperture was tight but the glass was unscratched, so I had the lens overhauled for $85 (money well spent).
If I were to spend over $1,000 I would want the camera to be in very good mechanical shape. Why pay a premium price for a camera that needs work when you can the same camera for a lot less that needs the same work.