And there you have it, a pretty much guaranteed way to double your money in Runescape. If you don’t have enough money for this to really be effective. Yes, this actually works and is extremely easy to do. Obviously, this strategy is only really worth it once you have a moderately large amount of money, 50k or so is okay but 200k and over is ideal. The general idea is to merchant feathers.
Head to the chicken coops at the ranch north-east of Lumbridge castle. Be sure to be carrying around a large amount of money (The more money you carry, the more money you will make).
Once at the chicken coup say “buying feathers”. For this strategy to work you will be buying and selling feathers. Because the chicken coop is often full of newbies who want to get their combat lvl up on chickens, most of them do not know the true value of feathers. At first, feathers may seem useless but they’re actually in high demand because they’re useful in fishing and fletching. Once you find a potential buyer, offer to buy their feathers at 2-3 gp each. You can go a tiny bit higher but do not go higher than 5 gp per feather. Keep buying them until you have used all your Runescape Gold.
Assuming you have now used all your gold on feathers, it is time to sell them. Go to world one and find a crowded area, preferably a bank. Here you will find a lot of people (mostly members) willing to buy feathers at 10gp each for fletching (which happens to be a members only skill). You should have bought your feathers at no more than 5gp each, so you should be at the very least doubling your money. If you bought 50k worth of feathers you should now have 100k in your pockets.