Shaun, your average payout is $670. So lose $570 x 203 = -$115710.
Win $100 (@94%) = $94 x 645 = +$60630.
Therefore loss is $55080, based on $100 lay stake.

$100 liability is completely different.
203 x $100 = -$20300
645 x $16.49 (100/5.7 to 1, @94%) = +$10636.
Loss = $9664