When most of us reffer to WOT, we don't mean we're going flat otu down a highway as fast as we can with our foot to the floor( although many of us have done that on occasion). I do WOT maneuvers with my car every day. Th edifference is, my car is only at WOT for brief moments, maybe 10-15 seconds at most. Usually, I'm trying to get ahead of someone in traffic, or just messing around.
Also, I don't think you fully understand the WOT procedure that most of us are describing for blowing out carbon. Drving flat out as fast as you can couldn't be further from what most of us do when we want to blow out alot of carbon. You put the shift in second and run the car up to about 75-80mph from 25 or so, and then let the engine brake the car back down to 25 or so mph. Doing this 3 or 4 times (or until the cloud is gone) every once in a while (provided you reare;y give it WOT) is what we suggest to others who are wondering how they can descrease oil consumption. This procedure does work, and has for many people.
Most of us never drive at WOT down the highway for extended periods of time, because that's a sure way to where stuff out quickly. The occasional rev to 6000rpm does help keep the rings seated, and isn't necessarily bad for these engine. As I mentioned before, what's the point of having an engine that was designed to produce it's maximum output at 6000rpm, if you never let it rev to that point. That's liek driving an S2000, but never shifting past 5500rpm. You might as well be driving a Taurus or something.