There's usually no reason to ever put Lego blocks on the trash heap. They last forever and they're easy to resell locally by the bag when you're done. There's a

There's usually no reason to ever put Lego blocks on the trash heap. They last forever and they're easy to resell locally by the bag when you're done. There's also a vibrant global secondary market of online used Lego block resellers (Bricklink, etc.).