If it was, every recycling plant in the country would be running 24 hours a day. And cities and counties wouldn't be dumping that potential profit into holes in the ground.
Those markets are for cleaned products, not garbage. They exist solely because of government mandates in various parts of the country require them or require cities to "clean" their garbage. The real cost to sort and clean garbage to make it sellable makes the entire endeavor of "recycling" unprofitable without government subsidies or tyrannical environmental mandates.