On Betfair you can get odds of 1.01 up to 1000.

Imagine going to a bookie and saying I want to put $12 on every horse in the race and I want you to give me the odds of 1000 to 1. And then imagine him accepting your bets at those odds.....

That is what happened....

The 2 favourites were paying about $2.50 on the tote..... This guy backed them at 1000 to 1......