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I don't think it matters that much. The concept isn't that hard for them to grasp.
I don't think Jacmob had much more "expertise" than any other programmer. Jagex employee's know how the bots work. There isn't anything that...
I've only started looking at RS again today. I noticed hundreds of bots farming willows in draynor so I thought it must have been worth farming.
What is the actual gp/h for willows?