Many boards get posts that do not belong.
But I am wondering if "part" of the problem is the difficulty in finding the right board for a posters question.
So here is what I propose:
Have the Mods of every board fill in a KEYWORD section attached somehow to every board.
Limit the number of keywords to ten, for instance.
Implement a SEARCH by KEYWORD feature.
So that when I want to know how to do something in the iBox, I search on HELP IBOX, and all the boards that proclaim to offer help on iBox matters show up.
Or if I want to find the latest pictures by Paulie Cashews, I put in the word "LUBE" into the Keyword search.
Might make life easier, all around.
Step aside son, you're blockin' the MOMO!
Disproving absence of evidence should be easy, show the evidence of.