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Tavis, for starters, I've done this process more times than I care to count. I'm glad that you listed all the reasons that it wont work, because it shows how little you really know about motors. Before insulting someone about their process, it would be advisable to ask how it is that they came to that conclusion.
You're right on one thing, the water is much higher frictional resistance than air alone, which is why it helps to break in the motor to begin with. BTW, 9v wont come anywhere near close to toasting a motor, especially one that's submerged.
As far as new cars, yes, I currently own 3 cars (going on 4) and one bike. I can provide countless images of all of them if needed. None of which are stock, and none of which are older than 2000, nor were any of them purchased used. The reason that engines are broken in at low speed (which isn't true in all cases, like an S2000 and Maranello for example) is that the motor while it is breaking in is shedding tiny bits of metal on the frictional surfaces of the engine. These little metal bits are trapped in the oiling system to be recirculated back into the car, which can cause gouging and many other harmful sideffects. A DC motor dosen't have this problem when it is water broken because the metal pieces are transfered into the water (as you can see in Sherifx's bottom image) which is what causes it to turn cloudy and gray. Breaking in a motor outside of water will always yield a higher percentage of metal retained in the motor.
The voltage issue is a personal prefference. I break-in the motor at high voltage because A: that's where the motor will operate when it is in use, and B: the heat causes everything to expand to its extreme limit, which will cause a more complete and absolute break in. This isn't to say that any other method is incorrect, simply a matter of personal preferance.
P.S. Engines are only reccomended to be broken in in the process that they are because 99% of owners won't go through the process to break them in as a race vehicle. The manufacturer gives you a generic procedure to stick to.
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