Alright, I'll be more direct, Eric. We can see if that helps. A 5x6x3 block may have some value if someone needed a bigger block to make something out of. It would need to be pretty special to have more value per square inch than a pen sized blank.
If it is only 3/4 to 1" thick, it would most likely be cut into pen blanks or knife scales. If I am buying a block to cut into blanks it is because the cost per square inch is much cheaper or the material is quite special, in which I am only looking for it to be a little cheaper.
If your block is 5x6x5 it may have better value as a block. But, in that case I like to know what I buying and that becomes more difficult with a hybrid from someone I do not yet know.
There also folks who need 6" pen sized blanks. The other thing is that for a pen turner, it is hard to tell how the block turned out. An individual may prefer more Alumilite, more wood or a balance of the two. They may prefer more natural or more geometric/ straight edges. All of that comes into play.
Ultimately, you will need to decide, if you are casting hybrids to sell, what audience you are playing to. Or more likely, start listing some and listen to what your audience is telling you to play.
Good luck.
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