This is old, I know it. However, recently it has become a new taste. I mean tournaments... you organize them for all of us, and it is fun. For Div4. It is not recommended for Div2-3. And it is an absolute nightmare for Div1.
Why? Simple - experience-based divisions force people to avoid collecting xp at all costs. Noone will collect an extra 500 xp for earning 500 prestige points that earns 50 energy bars for him. It simply isn't worth it.
Change it! Make tournaments available for everyone, regardless of division! Strength based divisions would be great, but I could also imagine other solutions, too. Just remove considering xp - it makes the main purpose of this game upside down! And it also makes monsters with lvl24 and a strength of 20-50 k appear. Force them disappear!