I would like to have a whinge about this also. I don't travel to the SA deserts every year, but do get there regularly. It cheeses me off that I can renew a Desert Pass every year after the initial purchase for just under $100, but if you have a break then it is the full $160 again. Surely there must be a cheaper alternative if you don't want all the maps and etc you get with each renewal. Have mercy, I am sure my maps that they sent years ago would still do the job as not a lot changes out there. And what happened to the windscreen sticker, the piece of paper sucks.
The second whinge is the online campsite booking procedure. I am sure a lot of people don't work to a daily schedule on trips (we certainly don't) and like to drive along choosing to stay on longer, or leave a camp, as the whim takes us. Throw into the equation the vagaries of outback travel (weather, breakdowns, road closures, road conditions, etc), combined with the lack of internet access away from towns to apply for permits, all combine to make for an inefficient system. It could also lead to a dangerous situation where people will push themselves, and their vehicles, to reach their pre-booked site for fear of losing it.
Sorry OP, I just needed to vent and haven't helped you at all.