> Probably the same reason the rest of the toilet is Not all of the toilet is ceramic/porcelain. Seats are typically made of durable plastic and are designed t

> Probably the same reason the rest of the toilet is Not all of the toilet is ceramic/porcelain. Seats are typically made of durable plastic and are designed to be replaced every decade or so. A plastic lid would probably last much longer. > ...and is easy to clean A lightweight lid would be easier to clean.