Corrupted dark bow

High alchemy turns Corrupted dark bow into 150,000 gp. Buying one at 1,000,000 gp (its guide price, as it has not traded today) and casting with a nature rune at 138 gp costs 1,000,138 gp. That is a loss of 850,138 gp per cast at its guide price, so it is not worth alching for profit right now.