I was genuinely curious about this...
What is the logical outcome of excluding yourself in the trust system?
Well, it would mean that your own judgment is not to be trusted, which means that you don't recognize your own exclusion, which is probably why it disappeared...?
Just like with any other user - it should move my sent trust ratings and flag supports into the "untrusted" category. It might get a bit murky with network level 1 and 2 though. If I'm excluding myself then I guess ratings of my inclusions should also be not visible to me if depth > 0.
Well, fortunately for those poor souls on the blackball list, they can always create an alt account or just use one that they have handy. After all, we need more alt accounts bitching about the trust system. We can never have enough of those.

It didn't work out for Quicksy. TECSHARE figured out his alt and removed it, allegedly.