The problem is that you can't really play the mod with too many people. For FFA, it becomes pretty bad with like 10 people running around, there is no point in hiding any more then. On the tdm mode it's nearly the same, with around 6-7 people per team it works fine I guess, but more than that just gives away the point of the mod. It comes to a simple deathmatch with bots running around then. On some Maps (the bigger ones) you could surely play with more people than 6-7 per Team, because they are pretty big.