Would it be all that chastising, though, to post a status update that says:
"MamaMootz wants to alert everyone that she won't be able to attend any sales parties."
But I don't think it would be effective.
I vote for the age-old approach to spam: delete, delete, delete.
I think you're right, it's just marketing, and therefore it's not subject to the rules of social etiquette.
Plus, deleting gets the whole idea out of your mind faster. (see "voting with my feet")