A reward for finishing quests and keeping chests on the boat

Ok guys, I think a simple thing could make the game really great,
Curently, there is no need to finish a quest, but how about multiply all the chests that you've earned with a quest value (maybe just the reputation) when you have finished it?
Why ? Because the fact that you will have to keep the chests on your boat to get the bonus will make the pvp way more interesting.
Beginners with little quests will have 4 or 5 chests and the high levels with longer quests will have a lot of chests so players will take more "challenges".
Those who just want to sell their castaway instantly can do it with the same money they would have earned before.
For me, this is a really simple thing that could change all the gameplay and make it way cooler