Well, technically in this event it doesn't matter if you have 400k total power and can do Ultimate map with a breeze, or if you can do only Beginner, as in the end event drops/stamina ratio is the same in all 4 maps. Heck, being low lvl and being able to ding new levels often, especially with Beginner map that has best exp/stamina ratio, can probably help new players with this stamina heavy event.