Went on a ski kaos trip by myself once. It was pretty good price if you're travelling alone.
As far as accommodation goes (I stayed in Jindy, so dunno if any of this is relevant to Thredbo), the place I stayed was some kind of self contained apartment. It had a bathroom and kitchen, dining and lounge room etc., then three rooms filled with bunk beds to accommodation 4 or 5 each.
Also, when you fill out the preferences on the excel sheet booking form they give you the following options:
0- very very quiet
1- pretty quiet
2- a little quiet
3- some noise but it won't go through walls
4- the next unit will hear us
5- the next building will hear us
0- no partying at all
1- a little partying
2- some partying
3- average party level
4- heavy party people
5- extreme partying
From what I could see the demographics was made up of young and old, couples and groups. So basically couples and older people group in apartments together and young groups/singles were grouped together.
I think I selected 3 for noise level and 1 for party level, but still ended up listening to loud talking and laughing half way through the night. I guess depending on people that end up going, it could have been much worse, but my point is to look at it as a 2 group choice and after you decide on what you want, you're better off just voting 0 or 5 and forget the levels in between.