Screw this...it isn't a sliding scale...
 
I can recall to this day families (that I couldn't give a flying F) if they were invited to my wedding...that my wife included...
 
Family of 5
 
Cost to feed: 125 dollars (not counting what they scarfed down during the open bar)
 
Cost of gift from them: 15 dollar blender from Walmart that we later found out was SO damn old it wasn't even in their system...it was an ancient re-gift...
 
Basically tossed it in the trash because it was a POS
 
 
My advice would be to cancel the ceremony and go to Vegas...have a great time and have a small reception later for those you care able...save big time!
		
		
	 
 
My wife and I went to a wedding last September and I couldn't believe the trash that showed up.   There was this family of white trash rednecks that showed up wearing shorts, t-shirts, camo, etc. and they were loud and rude.  So when the reception came, we were at table #6 and they were at table #9; the number of the table indicated when you got to go up to the buffet.  The white trash dad came over and switched numbers with us.  I thought he was doing it to be funny, but he kept the numbers switched.
 
Had it not been a wedding, I probably would've put my foot in his ass.  The moral of the story, folks, is that there are three types of people:
 
1.  People who hate weddings
2.  People who go for a free meal
3.  The people getting married