Maybe instead of having a points system, they could have a system similar to what Graal the Adventure has with events. If you win a certain amount of times you get "X" amount of tickets that could be exchanged for a prize later.
These spars could be changed into a type of arcade.
Though the only problem with that would be the population of grail all trying to grind for something at the same time (if it ever were to be created like this.)