|I've just returned from a week at Moonarie. It was going to be 2 weeks but rain arrived...
I highly recommend Top Camp. I think it's lovely, and am happy to leave walking up hills to aspiring alpinists (admittedly I don't think Wendy fits into this category). It's true that it's a challenge to lug all your stuff up the hill, but I'd elect one trip of suffering rather than a rather arduous daily hike.
I will add that it was quite horrible indeed when the rain arrived and we were staying at Top Camp, because there is no space there to set up a tent, so the rain did inevitably seep under our tarpaulins, and into our sleeping bags, etc. But overall, the positives of staying at Top Camp outweighed the negatives.
We fit about 7 people at top camp comfortably, so I don't think space is an issue.
The water supply didn't appear to be very limited, but I'm no hydrologist. We used water consistently for cooking and cleaning, and I don't think that's a waste (sorry Wendy and to anyone else who disagrees. If you get up there and there's insufficient supplies I'll buy you a glass of water next time we catch up).
I found this online guide helpful http://www.thecrag.com/climbing/australia/moonarie . However I feel that the authors of both the online guide and the printed guide suffer from a terrible affliction whereby crappy routes get starred (thankfully this doesn't seem to have occurred in the update indicated in prb's post - great!). When there are impeccable 3 star lines at the crag (eg Downwind of Angels), vastly inferior routes (eg Casablanca, Hanging Fred Bonnet) should not be given the same status IMO. Of course stars are always going to be subjective I suppose...
Have a great trip :)