I was in the top of the arena once and was farmed by one powerful person who came every 30 minutes and took half of everyones stuff. We could not beat him and get it back. I am glad now that the top players must pick on each other instead of feeding on the weaker ones. I do think stakes should only be taken once and once taken back should be safe. I also think the rank rewards in the regular arenas should be a bit higher since at level 15 they are almost laughable. Other than that I wouldn't change anything about the upgraded arena. Sorry.