Welcome to get it and sell it 2. This is a bit different than the first.
Requirements:
At least 100k
Being a member would be an advantage
Thanks to Beanraider9 and Gaileron for this!
WARNING: THIS TIP MAY CAUSE LOSS OF MONEY. I WILL EXPLAIN IT LATER IN THIS GUIDE.
Once you have your 100k, go to the rune shop in port sarim. However, be prepared. You need to sell this stuff on the forums, and people might not buy the runes. This is a bit risky. Buy the fire, air, death, chaos, water, and all of those other runes there. Once the amount of the stock of runes that the shop has drops to 800 or below, change worlds. This is called world hopping. Keep doing this until you have drained all of that 100k or close to it. Then, go on the forums, post the runes that you are selling and the cost per rune, and tell them to contact you in game by pm-ing you. Then, go back into Rune Scape and hopefully those buyers will come on in. Also, my former boss with my former job, Gaileron, had a business going on. He hired people like me and Beanraider9. Sadly, he quit Rune Scape and now me and his other employees are out on their own, as far as I'm concerned. Beanraider9 is doing really well, actually. So, what you can do is hire some people to buy the runes for you and then you go on the forms and sell them.