Debatable. Since you say high level I'll assume you mean getting the gp through combat. Most methods, excluding nex, are in the 4m/h range I believe. I'll be generous and say 5m/h. So 200 hours of gameplay for that 1b. Thats far from easy in my books. It would be much easier and fun to spend 40 hours getting 200m (assuming costs similar to herblore), 50 hours smithing, and playing with untradeable armors for 110 hours. you must not do nex then