Constant maintenance does a headset no good. I too have trashed Campy headsets way before their time. OTOH the original HS on the Cinelli went 100k and was regreased maybe twice. And was still working smooth when I let that old warhorse go. To waste a headset all you have to do is turn down the toprace 5 degrees too far. If you service the bearing compulsively it doesn't matter how good you are, sooner or later the bearing will be too tight and that's the end.

The inner tube shield (not seal) works fine on commuters. It doesn't keep out water. Water will find a way. Then the rubber holds the water next to the metal. Rust. Peel the rubber off and be surprised by rust. Do that to a '94 Hardrock or something. Don't do it to a '72 Pro.