You should have made more than $22 for that much metal. Did you pull the aluminum heat sinks and hard drive bases? The lids to HDD's are stainless, but the bases are milled aluminum. I made $60 from 1/4 the towers you grabbed.
Some places will also take the fans as copper motors, and I found one that gave me some cash for powersupplies intact. It really helped to de-bulk my stack. Now I just need to depopulate.
All the plastic I had I was able to take to local recycling. No cash, but it didn't go in the landfill either.