I have Woodworking at 59 +1 and have bonecraft at 5. I was gettin breaks of crystals and full breaks. So bonecraft higher than 5 as a sub i'm guessing.
Just turned one of these in for guild points and received 1218 points. Pretty Decent, staff sells for 8k on AH on bahamut, buying oak lumber from the guild for 5200 saved me a fair amount.