I went to SW many times, and never paid for anything (free radio station tix). It was a great place, but lacked on several fronts - it was small, so couldn't accommodate large amounts of people - which in turn made pricing high, to offset that, which in turn kept people away.
Due to many of the attractions having both mechanical and VR elements, there were lengthy processes to group, load, set up, and start, for what then amounted to a fairly short experience.
Rail Chase was certainly an awesome little experience, but all-in-all it wasn't that great when compared elsewhere. It certainly wasn't the first indoor coaster in Australia (not sure if there are others out there, but Expo 88's SuperNova was definitely prior), but probably was the only one operating at the time.
The tank battle thing was also a bit ridiculous - such a large floor space, difficult to operate 'tanks' and a distinct lack of ammo.
Honestly, in a similar space, Intencity Parramatta had a much more superior offering, and as everything was 'user pays', pricing was much more reasonable, and capacity \ wait times were much more tolerable.