Hey there I know there's people out there like myself who on occasion buy dilithium based weapons and equipment and may eventually trade them in for something else. When you do so and decided to get rid of said old equipment you get ec instead of a percentage of the dilithium you spent, but wouldn't it be nice to get a bit of the dilithium back?
This is partly because I recently accidentally bought the wrong weapon, and can't really use it for what I wanted. I was going to get a romulan turret and got a single cannon by mistake and there's no way to trade it in for some of the dilithium I spent to recover something out of it. This idea has been rolling around in my head for a while now but I kept it to myself till this moment.