Halloween may only come once a year, but a boogeyman scarier than any trick-or-treater haunts some Christian Science churches weekly and year-round as it has, regrettably, for decades. That anomalous specter is coldness and indifference shown to visitors and even fellow church members.
With torpidity, apathy, decline, and decay staring glumly at church members week after week, why would they add the cold shoulder to an already uninviting environment? And this isn't a problem which can be remedied by forced or artificial warmth or phony and insincere bonhomie, but only by letting "Love [be] reflected in love".
If Christian Scientists don't express spontaneous warmth and Christian love for those attending their churches (and everyone, for that matter), then all that's left is a really scary fellowship of zombies.