The risk/reward with these levels is so far off people literally would rather sit around and not play the game waiting for the gate to change than to play a compound. More loot boxes would make the compounds actually worth the fight through them. It dosen't help that they have very low loot box rate to begin with.
They have been actually increased once... Still not enough though, they should reward more than an average level because they're far more challenging. Or just make all the boxes there red loot boxes instead of green ones.