(These answers are given in the context of the ADE surveys)
The ADE surveys are participation based walking treks and are definitely not camel-riding safaris that use wagons or follow station tracks/roads. As ADE changes its operating area every year, there are substantial costs incurred in transporting camels, equipment, crew and trekkers to different deserts across the continent, stretching from central Western Australia to Birdsville in Queensland.
ADE endeavours to keep prices as competitive as possible and give volunteers exceptional value of money. However the cost of operating any business in remote Australia is considerable and transport costs have particularly impacted on our operations in recent years. Keep in mind that most of the surveys operate in extremely remote areas that require complex logistics & management, well away from the infrastructure that exists on the desert fringe or in other more 'suburban' arid regions such as the Flinders Ranges.