I've considered "by the pound" for ribs but given my location - rural upstate NY - I'd be willing to bet that would be even more problematic than trying to determine a set rack cut. By the pound would definitely help the margin control - just don't think most in the area would go for it.
Though thinking I might float the idea & see what folks think...
So back to the question - when you go to a Q joint & see "1/2 rack" on the menu - how many bones are you expecting?
Cha Cha Hut BBQ : 43311 Route 28 (corner of Route 28 & County Road 38: Arkville, NY : [URL="http://chachahut.com"]chachahut.com[/URL]
Backwoods Pro Jr.
busted Backwoods Fatboy
Weber 22.5 Kettle
some stainless wood fired thing