Doubles tourney aint filling because people like it, but because any pokemon can enter. Kinda easy to bring 6 pokes then. This isnt showdown where you get any team you need instantly, not many people want to rebreed a 2nd or 3rd version of some OU mons just to fit the tier. And then the team get scouted by the 8 double players who fully invest in it. Boring tier, no wonder it is always the same people who win them.