Greyhound bus Australia question.

[Mondaybaby]

On the Greyhound bus website there are 5 or so different price bands for the same coach. There are no reserved seats and there are no different classes of seats. So why the different price bands? There is up to A$50 difference in price and I can't understand why. Can anybody enlighten me? Thanks

From what i can see and what i have experienced, there is different prices for students or for those with 'passes' and also if they are having stop offs and then reboarding.