This is not to say the NRL shouldn't try this and other bold initiatives, but a reality check is important for the US sports market. (lived here for 17yrs)
It is competitive, crowded, and parochial.
You have significant television/on demand viewership, live attendance, and revenue across this in male sports alone;
- American Football (Pro, College, High School)
- Basketball (Pro, College)
- Baseball (Pro - major/minor)
- Hockey (Pro)
- Automotive (NASCAR, IndyCar, and increasingly F1)
- Soccer Football (MLS, EPL)
- Golf (Pro)
- Tennis (Pro)
- X Games
- eSports
- Gambling sports (poker)
- Fight Sports (MMA, Boxing, Pro Wrestling)
- Collegiate Tier 2/3 events (Track & Field, Wrestling, Lacrosse, etc.)
- Major world events (Olympics, World Cup)
(and there is likely some I have missed)
Once you then add womens' sports of most of the types above, the fact that foreign high profile teams almost always play in US in off seasons (i.e. La Liga, Serie A, EPL), large diaspora followings of foreign sport (i.e. Mexican Americans with spanish language leagues, Indian Americans with cricket, etc.), you realize very quickly that while successfully breaking into this market is obviously lucrative, it is also one very large hill to climb.
The other thing that is important to note is the 340M number of US population and that is can be misleading. If you look at the 18+ audience below, +/-25-30% consider themselves avid sports fans, with a similar amount not sports fans at all.
It will be much harder to convert a casual sports (or non fan) to a new sport, when their current viewing and attendance probably consists of Super Bowl, their alumni college team, casually watching local team when with more avid fan friends or family, or support US teams/athletes at major events.
30% of the US adult population is approximately 90M. Successfully penetrating 1% of that audience now is only 900K.
source: https://www.statista.com/statistics/1018802/sports-fans-usa-age/
All I will say finally is that this is a tall order. When a recap and post mortem of the performance happens, success should strip out attendance by Australian fans traveling and Aus expat australians in US/elsewhere because these are both mostly groups of existing fans and the goal is ultimately to convert a new audience and new incremental revenue streams.
Spending $200M over 5yrs for 900K potential new fans is an approximate cost per acquisition of
$220 per fan. That along with both some sort of modelling on what an avg. fan is worth to NRL should be compared against any other investment the NRL could make, as well as any retention costs per fan to keep them engaged.