People forget the damage done to the brand over the years. A lot of older loyal fans simply will never return.
Also the Arena is a horrible place for the Lightning to play. Unfortunately Wayville is equally as bad. SA Basketball's failure to develop high quality venues is part of the fault.
Money. In a city where AFL is life, all other sports scramble for any traction with fans, media, sponsors and the general population. The WNBL and the Lightning with its 5 owners/management in 4 years haven't even attempted to do their own internal marketing well, let alone push into the mainstream media. Social Media, Website, Communication with the basketball public. It's like the team exists but the office see them as an afterthought. Sad reality of the Lightning/BSA/36ers office and has been the case since Jan left.
Instead of blaming the public or the media, basketball administrators need to take a look at what they're doing, what they can control. Get that right and the rest will follow and the Club will build a level of interest and support close to what they deserve.