War chests are all relative to how good your income stream is in the future. Eg, Union after the 2003 world cup to now.
AFLs war chest is the result of very favourable TV deals, but it is unlikely they will be so lucky next time (I think it will only grow slowly if at all, even with more teams). With high overheads with two new teams, some current clubs struggling theirs will be wittled away quite a bit I think, but they will be okay, and worst case, they relocate teams to tasmania.
The NRL is building for 2013 as a huge year. All our media rights, restructuring, expansion, 2013 world cup all coming in the same year. It is shaping as a real cash cow year. It would be somewhere between $50-100m, and in adition, there would be whatever money the ARL has, which is used to grow the game at grass roots and for internationals.
On expansion, the Bears will be completely self sufficient from the get go, and if done right in QLD, WA or NZ would be as well. Government money would be needed for stadiums, but QLD would be very generous, in WA we have allies in the Force and Glory and NZ would be a "southern" francise using a variety of current stadia. WARL NZRL and QLDRL will all be support mechanisms for any new sides.
Lets not forget that NZRL and the NRL are both restructuring in the near future. Dispite all the Telcrap hype, the future is looking good for the NRL.