BurlyGuys 
I dont think there is a formula but a list of priorities. If you know you can sell them for $20 but scrap them for $4, and you have the room keep them. If you run across something that needs the file cabinet space that you can scrap it for $5 but sell it for $25 I would scrap enough cabinets to make room. To me its like playing cards. You only have so much room in your hand so keep the good cards and discard the worse cards.
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