WMO, in bulk, has a positive market value.
Regardless of this, my council tip still takes it.
...I once went to the dump on the way to the scrap yard - trailer was loaded with non-recyclables which have a negative market value, and metal, which i was on my way to sell for money. Yellow jacket jobs worth leapt out, and told me i wasnt allowed to dump the metal there (but was fine leaving the costly to dispose of waste).
I explained to him i wasnt leaving it there, but i was on my way to the scrap yard, where they would give me money for it. He was wise enough not to be fooled by my ticky words though, and made sure he stood by the trailer like a hawk whilst i unloaded the rubbish, so as i did not manage to get one over on him and leave any of the shiny metal behind....