I noticed that if you are the only boat salvaging an area, your salvage area will deplete like woodcutting. Except it won't respawn back until one of the other areas get salvaged until it's depleted. So basically 1-2 areas HAS to be empty at all times, like "hot potato" game. Meaning that if you go solo, you HAVE to constantly move, which is far less afk, which defeats the objective. But when it's a populated spot like south of pest control with lots of players, you will never have to move because you always have players who salvage your other spots that you can't touch.
therefore, official or non official world, it is far more beneficial to us afkers to have a sailing salvage world.
p.s. compare how easy it is to get your wc/mining etc setup and go to your spot vs this sailing extreme awkwardness of moving slowly, reversing, steering left and right in juuuuuust the correct pixel spot that can catch 2 salvage spots at the same time.