Too bad you didn't bother to demonstrate it. I'm looking at a price list for Cherry right now. There's a price for 3/4, 4/4, 5/4, 6/4, 8/4, 12/4, and 16/4. Guess what all those measurements are? They're thickness. That means the price varies by thickness. On my price list, it's the only thing that price varies by. Looks like it's the only variable to me.
Can't argue with that logic. By the same token, I guess square feet is essence cubic feet. Interesting that you decided not to comment on one of my points. Do you want a price list with a matrix of thicknesses and widths?
todd