Argument from the purpose of man's creation

1. A perfect being mustn't want/need anything.
2. If God wants/needs the creation of man, then either God is imperfect or God does not exist.
3. God wants/needs the creation of man.
4. Therefore, either God is imperfect or God does not exist.

What possible purpose could there be for God to create humans? What else besides loneliness, boredom or other earthly motives, could be a reason for the creation of man? For a being to need or want something, it must not have something and therefore, such a being isn't perfect.