|221,100 per hour|
2,028 x Oak plank (1,028,196)
Making oak planks at the Sawmill is a decent way to make money. Each plank requires one oak log and 250 coins. The fastest way to get to the Sawmill is through the Balloon transport system, which requires completion of Enlightened Journey. Once you've unlocked the Varrock route, requiring 50 Firemaking, you can fly to the Varrock balloon, just steps away from the Sawmill, for one willow log.
Start out in the Castle Wars lobby, and withdraw 26 oak logs, one willow log, and at least 6,500 coins. Run north out of the lobby and north to the balloon, and fly to Varrock. Run north to the Sawmill operator, and select Buy-plank, and then Buy All under the oak logs. Teleport back to Castle Wars with a Ring of dueling, bank, and repeat the process.
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