If it's worth saying, but not worth its own post, even in Discussion, it goes here.
Worse, there is a 10 point actual arbitrage between Pinnacle and Intrade. Also, Betfair is close to Pinnacle. I haven't followed this long, but I believe there is a long-standing 5 point arbitrage.
If it's worth saying, but not worth its own post, even in Discussion, it goes here.