Why don't people do Boss Brawl?

So, I am a level 36 enchantress and am camping in Swamp for some time. I find it frustrating why there are never any Boss Brawl rooms open accept for private level 50 rooms, and most of the times they don't want you there. I asked many of my IG friends and strangers to join in, but many of them simply won't reply. In the end, wither my patience runs out, or we just keep dieing. I know I can solo the dungeon, but then that's too slow and risky. I only have one RL friend who also plays this game but he isn't always that active.

In just three runs, one with my friend and two with level 50s, we managed to loot 2 pinks and 2 purples in the short time we spent. So why don't people do Boss Brawl? Or am I missing something?

before the new swamp pinks came out several ppl farmed boss brawl. i did a lot too.
now everyone farm the new items in the new maps... may u join that partys

a lv 50 can easily solo the map, y would they open it public?

I do public maps, but it's pretty fast now. And there's lots of new maps to do first. Boss Brawl is WAY on the back burner. Way back. Way way back.