(contact) said:
Untrained laborers (like well-diggers) earn about 1 sp per day (PHB, pg. 72), and as they almost certainly take no holidays, that pans out to almost four gold pieces per year.
Four. Almost.
Almost forty; silver is worth 1/10th gold.
But, yeah, D&D has two economies; presumably, there are nobles or very rich merchants or somebody involved with the "adventurer economy", somewhere; those would be the guys you go to for the big rewards. Your standard village o' peasants is not going to be able to come up with a decent (by adventurer standards) reward.
And the guys that manned the ship, and brought it back to town -- how were they not entitled to a share (I'm assuming it was one share for the group, not a share per person)? Yes, the adventurers did the combat -- that's why they get a share each. But without the crew to get the boat back to dry land, y'all would have got nothing but an introduction to D&D's Swim rules. If the ship is big enough to have hidden cells and hide lizardfolk below decks, it's too large for one guy to handle, no matter what his skills. It's likely too large for a handful of adventurers, period, especially if only one of 'em is a sailor. So them getting a slice of the pie isn't that bad.
Taxes suck, but "death & taxes", right? As far as I know, real life ship salvagers have to pay taxes on the money they get.
If you really want to get back at 'em, don't attack them (that'll just make you the Dire Threat that the next band of adventurers are begged to stop) -- just arrange to be out of town when the bad guys attack, let the villains loot the town, then heroically return to hunt down said villains and avenge the village's suffering. And, of course, loot the villains' corpses. Who knows where they got all their loot?