Cassandra, please don't let the actions of others cause the rest of us to lose you. Just ban them from participating in future sock swaps. There may well be good reasons for their non-finishing status ... but I can think of very few reasons that might excuse the rudeness of not replying to anyone about it. Death (of the member or a member of their family), permanent injuries to hands/fingers (but someone else could post for them, even if no one else could knit for them), serious depression incident (been there, done that, could understand it). Something *really* serious .... but there are very few reasons that could excuse the rudeness ... the only one I can think of off-hand is someone who lives by themself, has no friends or family, and then has a serious problem. Very few people fit that criteria.... most have at least someone who could post a message for them.
So, again ... please .... YOU did your job, and did it beautifully. MOST people completed their responsibilities in the swap. People will step up to take on the responsibilities of those who flaked out .... please stay.