Well it also depends on the average wage etc, cost of living, blah, blah. $69AU a month isn't cheap for internet but it isn't expensive either, I sacrificed speed for more downloads and in order to stay within my budget that was the best I could afford.
I dont really know how much uploading I could do, it would all depend on how much it would slow the rest of my internet down, to be honest I am not in the collect every single rom and iso category so I would probably just grab isos when I actually wanted to play them on the real hardware. Being locked out of grabbing a couple of gig of cd32/cdtv isos due to torrent ratios etc just seems like more hassle than its worth to me personally.
I generally grab my stuff from usenet so if people with uber fast connections want to dump them up there from time to time it would be appreciated.