I think the server can only hold up to a max of 5000 players.
Trust me go to WoW's Blackhand/Auther and you will see WOW's max is somewhat little less then 3000 before a queue takes place.
It's not just that, once the servers hit about 3-3.5k lag becomes VERY apparent e.g monsters don't exactly hit back as often.
And also, the queue doesn't necessarily activate once the server hits a certain number of people - last night the Gysahl server kicked me when there were about 2.9k players on and I got place 420 in the queue upon relogging. When I got back in about 20 minutes later there were 2.2k players, which suggests a server-wide kick + crash or other problem o.0
It got back to 3.3k about an hour after that. Edited, Oct 4th 2010 4:58am by GuiltyBoomerang