I was trying to explain to my brother why I wouldn't use a friends band for my wedding. These friends wouldn't be invited otherwise - but if I booked their band, I'd also have to include their wives/girlfriends as guests, and have seats for them all at dinner. 7 piece band would then equal an additional 14 guests.
My venue does have a nice room where all vendors will be able to spend breaks, have dinner, etc, so I wasn't planning to include any of them in my numbers for the main reception. But should I? Besides my officiant and his wife, are there other vendors who should be treated as guests?