Every so often Jagex will come up with a new quest or come out with a new item or somehting like that. Most people will go and try to do the quest or get the item or whatever; but a few won't. They sit and wait until someone sells it and pays massiave money for them. For instance, when tribal masks came out people were paying absolute loads of money. I'm talking 5-10
MILLION gp for
ONE. Now you can get a full set for under 5k easy.
Recomendations: I recomend you have...Well SOME money, not a lot because the item dosn't usually require too much money, around 100k should be good. Mabye some armor, a weapon, and food.
Plan: If it's a quest, do it. The item you get might be tradeable, then again it might not, just try your luck and see. Once you get your item post on the fourms and sell it off to the highest bidder. If you're a non-member then go to world 1. This should easily get you 1-5 million if you're one of the first people to get it.
Hints & Tips: 1) I suggest you get as many of the items as you can so you get more money quicker.
2) Don't settle for items, always ask for cold hard cash. If you have money you can buy the items if you want them, and if you get items then you have to sell the items for money so you can get items you actually want. AKA: Big waste of time.