Theyve been nailed by people attacking non-deduction fixed odds trifectas too. Over a month ago I saw punters climb into a Mooney Valley race on the Saturday. Three of the runners started the night before so were a no show for Saturday. Taking a healthy boxed tri on the 5 horses left over (and the two favs were involved in the scratchings) meant that punters were going to make ample returns no matter what the result. Another group did straight win bets with the 5 runners, moderating their punts to the order of favouritism for each horse (ie: piling more on the lower divvy horses, less on the outsiders, etc).
They cleaned up.