I agree with John.
I have a temperature activated exhaust fan at one end of the attic, exhausting out the gable vent. Air is pulled in from the other gable end, you can feel the flow when the fan is running. I'm sure some air comes in the soffit vents as well, which is a good thing, you simply want that hot moist air replaced with not-quite-so-hot air. I really like the fan system, though per this thread that's one more electrical device. I can't see why having all your vents open is a bad thing unless air doesn't vacate one area or another due to short circuiting of flow.
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