When I was logging there was hardwood for the paper mills and hardwood for firewood buyers. The firewood people were demanding but rightfully so. The trees had to be no bigger than a foot on the butt, clean and thus iterated through the mud. They had to be of the higher btu trees like yellow birch, beech or maple and not ash, basswood or popil. Tops had to be no smaller than 4 inches. And for this I got $20 more per cord.
The paper mills would take anything up to 20 inches. Anything over that was typically log anyway and went to a sawmill, but if it couldn’t it was left in the wood for it, just no market for it.
But struggling to put huge rounds of wood on a splitter is something few people do. Most people want to split their wood four ways or in half. Breaking your back to lift huge pieces of wood makes no sense, nor does whittling down a huge chunk to lots of smaller sizes.
But this is in the Northeast.