ok, so I'm going to give you the two answers I hate, lol. It depends on your buyer and what's your time worth to you.
Basically What you can remove without devaluing can differ from buyer to buyer. By depoulating a board you may lower its value but increase profit by selling components. However you must ensure you are not doing 10$ worth of work for 5$ worth of pay. Everyone has their own threshold for what their time is worth.
I live in South Dakota and when I don't have anything going on in the winter and its negative 20 I break down a lot of boards. Much more than other guys, cause its worth it to me to stay busy.








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