I have 5,000 sq feet now for my warehouse, and I think it could be utilized better for scrap metals and E-Waste. At the end of the day I'm not sure the cash outlay for paper/plastics vs the payback is going to be worth it.
Might start buying nonferrous (alum-copper-brass) and ewaste only for the better return. If there's no yard around close maybe you could be a feeder yard for the nonferrous.