That's exactly the welshing I was talking about.
Here's another 1000 btc bet Inaba didn't pay:
https://bitcointalk.org/index.php?topic=92268.msg1217403#msg1217403At the odds of 500:1 that are in effect for this bet I will win 1000 BTC if I am correct (power efficiency is less 350 Mhash/Joule), and lose 2 BTC if I am incorrect (power efficiency is greater than or equal to 350 Mhash/Joule).