In real life pirate days, when true pirates had been on the seas and got their hands on a sizeable amount of money, they would go to a "pirate town" where they would spend a lot on a variety of luxuries and services. Including gambling.
Treasure in Sea of Thieves feels like it has little value to it. As it only contributes to stats and cosmetics. A pirate town in Sea of Thieves would be a social hub to spend your money in. Food, drinks, boxing matches, strength duels, raggedy casinos, all sorts of things.
