Interesting reading about Joseph Suallii the other day. Played state level football, Rugby, rugby league and basketball. Has just apparently signed a $2mil contract over four years To play league as a 16yr old. These sort of deals are a huge reason why changing the draft age would be crazy for the AFL if they want to get the cream of the athletes.
I'd ask 2 questions:
How often do players under 20 get that sort of money in rugby league?
How many kids at 15 or 16 are good enough to choose between rugby league and football as a professional career? I can't remember one - there probably has been, but I doubt money made the difference in the choice.
The main reason this kid is getting paid that money is because there's a tug of war with rugby union and they have to pay him big dollars to get him.