You can sell them for a few bucks - LDB seem to be $10+ non working, SDB non working I’m not sure, but if 5 volt is working, it should pull higher than a board w/o 5 volt. For MPU, all over the place. Mostly depends on amount of corrosion issues.
I just spent $30 for a set of non working boards, but that may not be “normal”.

Bottom line, some of us try to repair them. Don’t trash them. However, if you decide to trash them, I’ll pay for shipping to me just to keep them out of the trash, and yes, I repair them, but only for my use.