I get your point but thats not how markets work. Ik someone who has been trying to sell their sunken irons for like 20-25k for at least a week and he has STILL not found a single trade. Compare that to powerfuls regularly being bought for 20k+ and you end up in exactly this situation. So in this case the galleon list is definitely accurate
But lemme repeat myself, your point definitely makes sense but that point only applies to a hypothetical market
Also with luck fishing it only sometimes takes several hours to get a sunken, whereas grinding for a powerful scroll can also sometimes take several hours so even in terms of time spent there isnt too big of a difference