I was doing the airline pricing cross checking for June / July 2011 and discovered something worth noting.
(The departure point is Brisbane)I was comparing the cost of "return" flights against "one way" each direction on the same day direct. The departure leg was the same in each case, but the return was different.
Take careful note that flights out of Denpasar are priced in USD when booked as "one way". I found that Virgin exchange is around 4.5% dearer than ONANDA interbank rates.
Regardless, there was a saving of AU$87 by booking "one way" each way, against booking "return".