Ah! Wiki or no, you're still pretty clever, GoC.
Okay, I checked out the Discussion Page for the Wiki article on "Tally Stick" (your direct link doesn't appear to be working), and here is what they gave:
"The saying 'the short end of the stick' has no known relationship with the concept of split tallies. (See the article - The Long Story of The Short End of the Stick, Charles Clay Doyle, American Speech, Vol. 69, No. 1 (Spring, 1994), pp. 96-101.)"
I believe this is the article to which they are referring: retrieved from JSTOR.
Since this topic relates more to general history (the possible ancient or medieval origin of a popular expression), I'm moving it to the Historia in Universum forum.
-- Nephele