though on the other hand a majority do play on regular (and this number becomes a larger % of the total as the number of hours increases) which could be pretty easily chalked up to not liking the idea of giving themselves debuffs that, at least to me, make the game less fun but not that much more difficultGiven the large number of players who play at recruit level and the small number who play at Veteran it is hard to argue the average HOI IV player is looking for a much tougher opponent.
personally i'd love to see much better AI that can give a challenge of some kind without having to nerf myself and give them huge buffs
not to say i think the AI is actually broken as it is now but i think you're ignoring the other possibility's of why so many people play on regular but not vet