1. not televised
2. not attended
3. not professional
4. generally only played by expats
5. prone to falling over/lacking sustainability
6. often only involve a few games or less per 'season'
7. often only involve a few teams per country
8. as raiderdave says, really just for giggles and a beer after the match, hence completely unimportant but for those who participate.
Take it from me nsw, I've got real experience in international aussie rules. You AFL lot are all completely deluded as to the relevance and importance of these microbial spec comps outside of Australia.
And i think i mentioned it somewhere else but lets not forget, Earth = Rugby League Heartland
In the 2011 pool D matchup between England vs Wales, although the picture doesnt show everything, my est. of the crowd woud be max 60 people 
:_<> 