Very different experience here, then again I went in late June which, as has been said, is a much better time for it.
It's not, by and large, a luxury experience. Our stay at the Adelaide Hilton right after was far more comfy, it goes without saying. And yes, everything is expensive. And they will keep going on about how self sufficient and sensitive to proper usage of resources it all is (of course it has to be there). This can be very annoying to some. It's a mild irritant to me, but not a deal breaker

Now the good ...
If you are into nature traveling, it's a unique and stunning place. We took a remarkable hike in the morning at Kata Tjuta, for several hours (even in winter this required a very early rise, as we were aiming to be done before lunch); we took an afternoon/early evening/sunset hike around the rock, also amazing. We had a night time dinner in the middle of nowhere to go stargazing, one of the very best places to watch stars in the world of course (the only place I've been to that's been anywhere near as fun for this was Esalen in mid-August, and, well, there was a whole lot else going on there anyhow ...).
If the whole "majestic beauty of nature" blablabla doesn't do it for you, save your money. For us, we were there three days and loved it.