Upload & Sell: Off
then again what sense in buying a used 20D with 60,000 clicks for a certain price when you'd need to toss $250 at it a week later, etc.
and maybe you knwo that it's getting high and it getting more dangerous to be able to rely on it.
When you're buying a camera as old as the 20D, you should expect to replace the shutter and count that as part of the cost. It's either been used heavily and the shutter is worn or it's been used lightly and shutter lubricants have congealed.