Lets say you have all clans move to pk at the same times. It would basically be Foe trying to crash bunch of cb 65s in low lvl wild, mark my words it will happen.
Besides there is the multi-clanners factor aswell, for example OP. Anybody remembers what happened with them in the hpc scene? They got fucking slaughtered not due lack of quality, but because previously they were riddled with multiclanners from hpc clans who left Olympus making that poor clan go str8 to brown sticky stuffter. Another prime example is Dome.
These clans can try but they will all fail because the gap they need to jump is too big, whether its the ridiculous amounts of multi-clanners they got, lack of numbers or commitment from leadership.
Also why would anybody in their sane mind put it's healthy clan into that environment where the basic consensus is to bring as many mains as possible and fight in single for hours. It's just str8 boring and aids, the hpc scene will not do anything but get your established clan dead.
People can move up, but they don't want to move up into that brown sticky stufffest. Rather go down and fight lpcs than move up, more fun and more action. Not ragwars.