There are several reasons not to join the top guild.
You may dislike many players there and feel you would not enjoy the social aspect of being in that guild.
the guild may not like you
the guild may not have room for you and any people who want to come with you.
you may be a non coiner and have already used your one free realm change and the top guild is in another realm
so just joining the top guild is not always an option for everyone.



