fletching, 600k/h with broad arrows 
Cooking is 700k/h
Fletching is 540k/h @ -8 gp/xp
Farming is 1m+ xp/h @ -15 gp/xp
Firemaking isnt cheap. It cost me about 30m before the bot nuke.
Did you use only yews/magics or something? With maples it's really not that expensive.

