We have a good community relationship with the GW folks, and its mainly to give unguilded folks a way to check out the guild interface/schedule team fights, etc.
http://vnboards.ign.com/Guild_Wars_Community_Board/b22752/77012583/?1
In retail we will only field teams based off people who apply to the guild via regular methods.
This isn't a zerg based game, so membership size isn't going to be important. But LotD has been a leading GW alpha guild, so we're mostly being nice...p

Guildmaster Lords of the Dead (LotD)