"shipSellPriceMult":.8, ( default is 4. So effectively doubled the sell price of ships )
"hullWithDModsSellPriceMult":0.4, ( Default is 2 , so see above )
This has actually made me realize how much money I've been wasting holding onto ships, being eager to pull each and every ship possible along to a planet although the cost in supplies to repair them or just to maintain them enough for the trip was worth much more. With all the appropriate leader traits and three salvage gantries and three drone tenders in my fleet, I grab much more wealth salvaging most ships, low-techs and pirate hulls than I had been selling them.
Resource recovery effectiveness: 214%
+100% Heavy machinery available
+50% Salvaging skill
+64% Fleetwide salvaging capability
x1 Crew available
Your fleet also has a 50% bonus to the amount of fuel recovered, and a 50% bonus to the number of rare items found.
I've actually been desperate for another source of supply besides the markets where my mission earnings barley break even with the resupply but by salvaging ruined ship hulls and having my fleet and leader traits, that turned right around. Now I'll only bring back the largest hulls and better tech ships, spend a few days in orbit to repair them the best my fleet can and sell them with these settings values.