Out of interest, why are you offering a monetary prize?
I assumed it was some kind of scam to get PayPal details.
Could see the lion kit being used for someone like cameroon!
The only downside to a league system would be the voting.
Would everyone be allowed to vote or just people not competing?
If everyone it would be hard to remain neutral when you could be voting in a match up where someone could overtake you in the league.
If non competitors then interest may wane over time.
Maybe a series of mini leagues, with a knockout after, much like the World Cup, could overcome this with group rivals not being able to vote but everyone else could.