Now this makes no sense at all...

At the TAB it's $1.80 on Melbourne and $1.90 on Essendon, yet if you bet on a Pick-6...

BRIS-CARL-PORT-KANG-ADEL-ESS = $11.00
BRIS-CARL-PORT-KANG-ADEL-MEL = $17.00

Am I missing something?!