I dont think that Gantz is going to let you keep points.

But, in the series "Ganbare Robokon" after the robots would get 100 points, their master Gantz would give them one heart, and after they got 10 hearts(1000 points expended) Gantz would transform them in A class robots.

Maybe Hiroya would follow that example and give..i dont know..some "prize" to the person with 1000 points expended("super suit"?).