It's not common in DH's circle. The only family no-shows were two of his nephews. One of which is getting married on Saturday. Very tempted to no-show but we won't. It has coloured my opinion of said nephew and we aren't going all out on a gift, like we might otherwise have done. It will be appropriate and about the norm for the family, though.
I think that it is completely understandable that this could alter one's opinion of another. If I circle back, this is why I feel that it may be appropriate to contact the no shows. Not to shame them, but rather to alert them of the potential harm that could be done to a relationship. I imagine that most no shows are not malicious, but rather lacking thought.