Bill,
I probably have. Can't remember how it turned out. I suspect that it stretches the silk, causing it to look all wavy. Hence my comment about attempting to wick the stain, not scrub it. You'll quickly ruin things that way.
I pretty much only wear ties to church, anyways-- everybody I work with wears business casual. Even those uptight East Coasters have gone business casual!
Since I'm at home when I stain up my ties, they become my wife's responsibility. Hopefully that won't incite the relationship police =).
Brad