From reading the website it looks like anyone (from anywhere in Australia) can be a member for $250 (with a vote), but an investor (no additional voting power, preferred shares, shares are $100) can only come from NSW. And investors must be members.
Like others I can't really see the value of being a member if your not in the area, and I can't really wrap my head around how it could be run as a co-operative. BUT, if I had a spare $250 and was even contemplating taking my homebrew to a professional stage, then it might be money well spent. At the very least you would be able to read the business plan, see what beer styles sell (and which don't), have a good look at a couple of brew days, see (or better volunteer if possible) with packaging and cleaning etc.