It was an error when they first made Pure Essence. ANYONE, including f2p, who had either 30+ mining or 30+ runecrafting had all their Rune Essence turned into Pure Essence, which gave them lots of member items and unable to use it. Also, when someone ends their membership, if they still have Pure Essence, they'll now be able to use it since Pure Essence does all runes, f2p or not. However, f2p players are still only able to obtain Rune Essence by their own means. Pure Essence must be bought in f2p worlds, regardless if you're member or not. EDIT: I was never aware they even made it f2p... I thought the rule for the change from rune essence to pure essence, was that if you had a members object on your account at the time of the chance, your rune essence would be pure. PS: I was not there at the update, I heard this information.