Your dump has a pass you have to buy? If you pick something up it saves them having to pay to bury it. They are making money both ways.
My trash pickup company has a huge list of things you can and can not throw in the recycle bin. They only accept things that they can make easy money on. They have a huge label on the inside lid. One of the things on the YES side is styrofoam blocks so I broke up a big piece I had and put it in. I got a "ticket" from the trashman saying I did bad and a month later the company even called me to let me know again I was a bad boy. I told her the label said YES! She said it is an old label, I ask why they did not put a new one. She said we are slowly. They changed the rules in January and this was August. Well it is now end of October and still no new label.
There are now times I reverse dumpster-dive.