[TTT]

Very good article you've written b-)

I think what I was thinking of was more like the 'shock' factor, when you, say, slap your arm + watch down on the surface of the water, or spray a high-pressure hose directly at a button or the caseback. I think the watches rated for 200m+ would probably fare better in this scenario.
This is not my field of specialty, so I can't really say whether what I mentioned is in fact different from taking the watch to a greater depth or not.

 

[TTT]

Another example of this 'branding' idea is with the Traser watches - apparently, the p6500 (which is only rated to 30m, I think) has two o-rings in the crown opening, exactly the same as the 200m-rated versions, although it doesn't screw down. Someone on one of the other forums said he'd actually had his pressure tested to 200m, and it passed.