rugby and football are entirely different sports with different fan bases.
Putting them in the same forum makes about as much sense as putting hockey and soccer in the same forum.
Plus there are so many rugby leagues and then theres nfl, cfl, college, arena football frankley its wayyyy to many to have in the same forum.
It's just inconvenient to have sooo many betting threads, and the football section aleady has tons of threads to keep track of on sundays.
Having too many threads going makes it hard to make bets and discuss the games.