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In my opinion:
You can run 6 psi on your car and still get 75-100k miles out of it if you behave yourself and do not beat on it. Now that being said...I have 6psi on my LS1 and I got over 100k miles before I even started to see any issues with the pistons rings.
On the LS3 I would suspect it is very similar.
I also agree with you that there are some very high numbers out there right now on a stock LS3. I would think that these folks would also admit that they are not expecting their car to be a daily driver, and may only expect 25k miles out of the car. Another issue would be the drivetrain. The stock drivetrain is not going to last very long with 700HP on the flywheel.
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