If you, and everyone else, had more hunters it might be harder to accumulate that much exp for any one of them as they will thin out the animals so much that each one will not get to fight as many animals.
The AI would be much more competitive in hunting animals if they could spew out 30 hunters, very few human players would bother having that many hunter units and manually move them.
The increase in hammer cost would probably demotivate the human player before the AI, and the AI do have a decent discount on their hammer cost depending on the difficulty played.
@JosEPh_II : looks like DH is the new "mr. No-No".