Salvage laws.

Has anyone come up with a simple and game-balanced set of salvage rules/laws
for SJ.  It seems that if PC's find a ship with even 50% damage with a minor
helm and sell it at port for even 50% of its remaining value, they are still
going to make a killing.  Many SJ players/DMs' agree that the prices for
helms are a *bit* high.  Does anyone have a more reasonable price listing for
a sphere with common access to Spelljamming ships.  One suggestion I have
heard is to set the value of helms at 10% of listed book price.  This seems a
little more reasonable when you consider that mages and priests of sufficent
level can cast spells to create (temporary) helms.  In general, what is to
keep a party from becoming TOO rich for the campaign is they have a few
encounters with pirates or scor that are using ships with helms.

Terry