They can be used in so many ways-
To-go container perfect for leftovers. Load up the tray and all you have to do is place it on the grill and when you done, totally recyclable.
They fit perfectly for offset cooking.
They fit perfectly as a drip pan under the grill grate and on top of the charcoal grate.
They can be used to catch drippings and use as a braising container.
For 22.5 cents apiece it’s a no brainer.