Ok Matt, I'll disagree then.
I've put a few old cars in the junk yard with good running engines and understand your point, but what are the reasons why we strive to maintain our engines?
First, I would like the engine to run as close to the way it ran when it was new as long as possible. It's not so much a matter of how many miles I drive it, but how well it runs the last year I drive it.
Second, no matter how many years I drive my current car, and no matter how many miles, I don't want it to fail before I'm done with it.
Rather than drive it until the engine fails I would rather never know how far it would have gone.
Third, as the engine ages I would like it to lose horse power at the slowest possible rate.
Forth, I don't like oil spots on my driveway. If sludge contributes to oil leaks then I'm interested in reducing and removing sludge.
Fifth, I agree that 3k oil changes are overkill, but I also know that I can get better engine protection at 3k than I used to get with 3k changes on past vehicles.
So there, I have made my points. That's all I wanted to do. As a disclaimer I do admit that I will be increasing my oil changes from 3k to 4k based on the information I have learned here, and am waiting for two oil analysises to show up that I expect will support my extended oil change plan.