Originally Posted by noglider

You have my attention. I know my perceptions can be based on expectations and not real sensations. I believe I feel the difference between a chain that is well lubricated and one that isn't. I believe I feel the difference between a new chain and a worn one. Hearing that they barely make a difference makes it sound like I've been fooling myself.

And if friction and drivetrain wear are not compelling reasons to keep a chain clean, what reasons do you have?