How is there money in a second Brisbane team? who's going to support them? because the broncos supporters are not going to. i think it will be a big fail
The money is in the broadcasters, sponsors, and corporates that are all champing at the bit to throw money at a second Brisbane team.
If the NRL and the club it's self play their cards right (i.e. don't f**k the branding, have good community engagement, build a competitive team, etc) then the support will come from the literally tens of thousands of people from/in Brisbane that love RL but hate the Broncos.
The initial core of the fan base will probably be mainly made up of people who are picking up the team as their second team and then grow from there (which is the case for almost every club), that is assuming that the club is well run.
The problem with a second Brisbane club isn't the concept of a second team in a city in of it's self, all the examples of having cities with two well run and well supported teams prove that not only can it work, but that on occasion it can be massively successful and that the rivalry created can grow so big and culturally important that it basically makes the sport in that city, and in some rare cases has a significant impact on the sports reach globally.
The problem with a second Brisbane team is that most of the proposed clubs to be the second team have been terrible ideas for clubs that would either alienate most of the potential fan base before they had even begun (insert the suburban clubs and BRL/QRL clubs looking to make the jump to the NRL), spread themselves to thin by trying to represent regions outside of Brisbane as well instead of just focusing on Brisbane (the Titans relocation talk is a good example of that), or are carbon copies of the Broncos that would end up just cannibalising the Broncos support instead of engaging with the potentially huge base of fans that aren't interested in the Broncos or an aggressive corporate club like them (the Bombers are a good example).
So yeah, though I would agree that as things stand none of the current Brisbane bids fit what the NRL needs in a second Brisbane club, and the NRL would be smart to hold off on expanding to Brisbane until a better option presents it's self (or create a better option themselves), that doesn't mean that a second Brisbane club is an inherently a bad idea.