Honestly, after dealing with the wedding vendors I've spoken with in the last couple of weeks, its no wonder that new brides-to-be are so convinced that etiquette no-no's are ok. Here are some of the highlights:
Caterer: "Why don't you have an open bar for PART of the reception, then go to cash bar?? Or have only a cash bar?"
Florist: "You really only need seats for about 60% of the guest list."
DJ: "You really should do a Money Dance, you'll get a lot of cash for your honeymoon. Everyone's doing it." (this one may or may not be totally against etiquette, but it's just tacky to me)
I mean, after all of that, it doesn't surprise me at all that people come on here defending cash bars, etc. If the vendors themselves are spouting this shit, how is anyone supposed to know it's wrong? Almost every vendor we spoke with offered some sort of etiquette doozy like that. Thank God for The Knot.