Those who don't "fully" participate
I hate to put more work on those that coordinated SS in the past, but maybe you could put a list together of the non-senders and only share it with coordinators. That way a pattern may emerge, but no one else will know who it was. Things happen and if it's a one-time thing, then it should slide but if someone receives more than once and doesn't send, then they shouldn't be allowed to participate any more. I haven't mentioned it before, but my February SS was a no-show. Now my January SS, im4smiley, sent me enough for MONTHS!lol I may have to dig out the "keep warm" stuff again this weekend.sigh.: