500k+ a day (mem only)
Before becoming a mem get at least 40 fishing. When you're a mem go to the stealing creation minigame and get as many points as you can. Eventually you will get enough points to buy a proto-tool. Once you get it change it into a harpoo and start harpoon fishing(I would also recommend getting swordfish gloves once you're lv 60). At lv 76 you will be able to fish sharks in the fishing guild and be able to make over 500k a day. The best part is you don't have to be watching the screen the whole time, you can be doing something else and then click on the screen every now and then or play another game and you'll be making big $$$.
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