You're probably right - the question of pertinence to me, though, is: What is the usable service life of the Campy Ventos?
As per your (and Jobst's) explanation, the spokes are probably the weak point of the wheel (specifically, at their attachment point to the hub). If I can expect a year's worth of reliable service without spoke failures, I'm more than willing to respoke annually. If the spokes remain reliable for two years, even better.
I agree that "an ounce of prevention is worth a pound of cure" in this circumstance, so it would behoove me to inspect the spoke heads regularly. Should even a single spoke fail, it would be time to respoke the entire wheel.
Is there any way (other than obvious spoke head elongation or visible wear) to predict spoke failure? Thanks for the interesting feedback!