True. There were 9,330 at Vector Arena for game one, which was a sell-out, and 13,527 at Perth Arena for game two, which was not only a sellout but required opening up an extra tier of around 1000 seats. Vector also sold out for a regular-season game against the Wildcats, and Perth Arena sold out (minus the extra tier) for a regular-season game against the Breakers.
Turns out good teams are popular. None of the other teams have attendances even close to that, although Sydney and Adelaide are the only ones with home venues that side of 8,000. Melbourne did play a few games at Hisense, but could only draw around 5,500.
With that said, there's a lot other clubs can do that the Wildcats are doing, off the court, to increase attendance. The Tigers put a lot of work into marketing and increased their fanbase significantly, and were aiming to move to Hisense permanently and try and beat the Wildcats membership count of 8,300, although that seems to have been put on hold.
Townsville aren't dead yet, and things are apparently looking good for the shift to the community model (identical to Cairns, who've posted two straight seasons of profit), which leaves Gold Coast as the only club to fold since the re-structuring of the league in 2009. Sydney have also been added in that time. Gold Coast folded not because they were doing poorly--although, as with all Gold Coast sporting franchises, they weren't doing great--but because the owners suddenly decided to stop supporting the team.
The Blaze sacked Brendan Joyce a few years back, as Brendan was more interested in getting his son court time than anything to do with anything else. They refused to pay out his contract, so Joyce took them to court. And won. Then,
completely coincidentally, the Blaze went into administration. Negotiations were had with BA in order to try and keep them in the league, but when BA insisted that they know who the Blaze's anonymous $1M donation came from (perfectly fine with not publicising the name) and that the Blaze prove that they weren't going to immediately collapse a year later, the owners said that BA clearly wasn't interested in having them in the league, took their ball and went home.
Essentially, the Blaze folded because the Tomlinsons didn't want to pay Brendan Joyce the money they owed him. Them being dicks says nothing about the health of the league.