I agree that there is a market for this type of fuel. Currently there are several MFGs of this stuff. They wouldn't be in business if they couldn't sell it. But...I think this is a pretty small niche market compared to cord wood. I think its gonna end up being a volume thing. To do this for any type of mass market the bricks will go beyond using scrap material and into real trees. Why not burn the trees.
Note: I have no facts backing this up...simply my opinion.
Note: I have no facts backing this up...simply my opinion.