I was planning on making a thread for coal but if you become a worker for me, here are the incentives.
First, regular price I'm buying coal for: 250 gp ea
100+ coal = I'll buy them for 300 gp ea
500+ coal = 350 gp ea
1k+ coal = 400gp ea
If it reaches say 5k or more, I'll increase the price further. Best to PM me on the forums so we can log on at the same time easier.