I hope everyone would agree with this list:
- Soccer
- NBA
- Cricket
- UFC
This list is not based on betting revenue or based on the number of fans. It is simply compiled by me after watching the activity on this board for different games thread. I am aware that I did not add Tennis, MMA and Boxing as my question is about those sports that are not being discussed here but you do bet on it either occasionally or on a regular basis.
Football is the correct term for what you call "soccer". In fact, I doubt anyone here even recognizes that word other than Americans.
I would gladly bet on any sport as long as I get good odds and understand a minimum amount about that sport and the history of the players involved. You do not need to be a genius to research a players past history of wins/losses. Thats universal for any sport.
As far as to your question of specifically which sport which is not listed here that I would love to bet on:
Asian martial art/other fighting styles which are not that prominent in western society. Sumo, for example. In Japan, Sumo is a big thing and gets bet on all the time.