What's the point of buying art?

Aside from satisfying my inner completionist, is there any point in buying art in Assassin's Creed IV?

It's available for purchase from merchants pretty much right away, but it seems like a waste of money. Does buying it serve an in-game purpose or award achievements?

The art you receive from Fleet missions and buying in the store shows up in your house on Great Inagua. I am unsure if all of it does but I started to see a few in a room in the house. So I would think this is where all of it will be displayed. Explore your house a little and you might find it. It might also be worth mentioning that I have my house fully upgraded.

It's only purpose is to decorate your home. It doesn't count towards 100% synchronization and there isn't an Achievement/Trophy tied to them. So besides being a decoration at your house, they are pointless.