Club directors can do many things if the Club owner has set the permissions to allow directors to them. With Owner permission directors can invite new members, create tournaments, use super passes, update club messages, and email members.
Just to give the whole picture, these options aren't bound to the limited number of Directors. In fact, any kind of member "titles" may be given these rights - owners may see the settings table in the CC tools.
Thus, the rising no. of directors should NOT be a reason to push the CC level.
In the opposite, having NO directors may be of advantage for owners having the issue not to be able to edit the CC messages. The cure officially proposed for this program fault is to give this permission to any member type - why not give it to null Directors.