I finally figured out cleaning herbs for profit in RS3. Essentially, the more money that you have, the more money that you'll make. I started with 88K in my money pouch and then it gradually turned into a few hundred K. I was camping at the grand exchange last night in RS3 cleaning grimy avantoe. I started off cleaning 25 grimy avantoe, and then it became 50 grimy avantoe, and it finally turned into a load of 300 grimy avantoe. I finally figured it out. Thank you.