Well, if we can trust wikipedia (which we often can't), the Black Pearl was the Wicked Wench and Jack at some point in his life freed 100 slaves and was branded a pirate and left some kind of mark on Beckett. Labeled a pirate, he needed a ship and somehow met Jones who brought back the ship for him. What if somehow Beckett's mark is connected to the sinking of the Wicked Wench? Like he was on it when it sunk or the mast fell on him or something.
"Ok, so character sacrifices. Who wants to try their hand at Elizabeth? Or Barbossa for that matter. You should maybe mention something about sacrifice, but you could also talk about what might be motivating their character through AWE. That might make Barbossa's character a little easier to examine."----------------savvysparrow.
It's going to be very hard to talk about Elizabeth without going into a shipping war again, so I think I'll take Barbossa. What will he sacrifice? Well, there has to be a price for having a second chance at life and it's already come in going to the ends of the earth after a guy he hates and a ship he thinks is rightfully his. We can guess from the trailer that if he does try anything mutinous again with Jack, it doesn't happen first thing, so in a sense, he is sacrificing his free will. I'm sure if Tia can bring him to life, she can kill him fairly easily. Remember he lived 10 years as one of the undead. He's not going to be used to feeling physical pain. The concept of being vulnerable to death is still fairly new to him. So he's not going to be able to do whatever he wants anymore. Combine that with sailing with Will, Liz, and Gibbs who are going to be watching him like hawks, he's going to be sacrificing his free will quite a bit.
Part of his motivation of going after Jack and fighting with the pirates will probably be that he feels in some way he'll have more freedom, which is what a pirate always wants. You know how a woman always vexes a man? Freedom also always vexes a pirate. I'm sure he plans on getting his own ship if not stealing the Pearl again.