Also when you trade, and put an item up, it will tell you the mid grand exchange value for the item in the trading screen
And it will say what your trading limit is, for f2p its a max of 5k, for p2p, its a max of like either 60 or 100k, i forget. But the more quest points you have, the bigger your trade limit. And if you and some1 are on each others friends lists for like 4 months, u get even higher trade limit. For example, I've been friends with this kid on rs for around 2 years, and my trade limit is about 33k, and so since I am friends with him, it let me trade a max of 114k
The limit works this way:
Lets say your trade limit is 5k, to make things simple
And an item you want to buy is 3k
You can buy the item for a max of 8k (5k + 3k = 8k)
or you can buy it for less than for 3k, but ur trade limit then changes for the next 15 minutes
So lets say the item is 3k, and you get it for free, you do your trade limit - the value of what you got = new trade limit. The trade limit will steadily go up and back to normal over a 15 minute period
So if you buy an item worth 15k, for 10k, you will not be able to buy anything over or less than the trade price showed in the trading screen (If your trade limit is 5k)
Make sense?
Also Jagex got rid of the old Wilderness because it was allegedly used for Real World Trading (people paying real life cash for runescape gold or items)
any other questions feel free to PM me, I've played since 2003, and still play today