That's very interesting to me, too. Then I thought that maybe the answer is in the very chapter you cited. 1 Cor. 11:28-30:
"28 A man ought to examine himself before he eats of the bread and drinks of the cup. 29 For anyone who eats and drinks without recognizing the body of the Lord eats and drinks judgment on himself. 30 That is why many among you are weak and sick, and a number of you have fallen asleep."
So, Judas partook and was unworthy. Soon thereafter, he was dead. Maybe it's the perfect example.
And the key distinction is the call for each individual to examine himself, not for church leaders to determine who is or is not worthy.