Where's the substance? Where is the flair? Where is the * pizzazz*?
....Or in plain English, where is the reason for me to join?
I mean sure, you offer pirates a promotion if they join right away, but what is the point of being an Officer in a guild with no point? Not exactly the most enticing way to reel in new members.
Instead, try giving pirates a reason to join before you offer them immediate promotions - What do you do as a guild? What is the point of your guild? What are your guild rules?
What makes your guild special?