It's okay to be a hoarder in Pirates Ahoy (in the real world, not so much)! It's almost as if Pirates Ahoy creator Playfish wants you to be a hoarder since it has added the Pirate Warehouse to the list of available buildings to place on your island. However, you gotta' pay up if you want to gawk at more of your shinies.
Find the new Pirate Warehouse by going to your island and clicking the "Build" button. It's a huge mallet, so you can't possibly
miss it. Then, click that big and shiny "New" tab and the "Buildings" tab underneath to find the neat, not-so-little warehouse.
It gives user 20 more inventory spaces for Pete's sake! Unfortunately, this comes at the price of 10 Playfish Cash. Now, there's no need to start any argument over whether this is worth the dough, because an item like this should be considered a luxury. Good inventory management mixed with the ability to let go could easily circumvent the need for something like this. But, if you're the type who likes to have more things to look at (or hold to make some extra coins off of later), by all means get to your island and grab this--with suitable form of payment in hand, of course.