Upload & Sell: On
IMO, one should never sell anything that is useful. Just think of all the shots that you might miss over the next decade or 2.
More importantly, think of the workers that make this stuff. Every time you sell something, that means they don't sell a lens to the person that bought your stuff. Those folks depend on new sales for their very existence! They need to provide a home, food, and clothing for their spouses and children, who might even starve, if sales of new stuff goes too low. We've all seen the photos of those poor, unfortunates, living in squalor, fighting stray dogs for their next morsel of food. Seriously, do you want THAT on your conscience, living the rest of your life, knowing that you were responsible for their plight?
Don't do it, for the sake of the children!!
OTOH, that new 70-200 f/4 does look like a very nice lens.