They've had a lot of help from rich businessmen and lucky stadium rental deals, but they've definitely made the most of it.
Of all the Sydney clubs, South Sydney have moved beyond their traditional base and it's turned them into the best supported side in NSW. Part of that was forced on them by their fanbase being forced out of Redfern due to gentrification, but it's definitely helped them in the long run. Of all the clubs, I think Roosters and Rabbitohs are best positioned to become the Broncos of Sydney.
Penrith has a small but growing fanbase, but it's well behind the bigger clubs like Parramatta.
Canterbury were a big club who drew a decent crowd when they were going well, but the demographics of their district is changing. The Middle-Eastern community that is growing in the Canterbury-Bankstown region is staunchly anti-gambling and anti-alcohol. This could have a serious impact on the Canterbury Leagues Club over the next 20 to 30 years. The only thing keeping this club alive is gaming machine revenue. Take that away and they're f**ked.