According to the Royal Bank of Canada Financial Group, the average two-storey home price in Saskatchewan in the first quarter of 2006 was $175,000 (Canadian, I guess). So that's not a bad set of trades. Of course, as his plan got into the press, people were no longer just trading for the good, but also for the experience of being involved in his scheme. All in all, though, that's a pretty nice rate of return on his investment...
[Another interesting note in all of this is that part of McDonald's final haul includes "$200 in Kipling Cash" which "can be spent at any local Chamber of Commerce business." So that's another place in the world using a non-official currency. With only 1,000 residents in Kipling, it surely isn't used to the degree that private monies were used in Argentina recently, but it is still noteworthy.]
(h/t to David Pogue, NYT)