In the guide for The Great Orb Project, it says that the runecrafter robes that can be bought with the tokens earned from the minigame give a +8 boost to runecrafting, and that this boost lets you craft more runes per essence than you would without the boost during the minigame. I just tried crafting airs during a game of GOP, and I only got 6 air runes per essence (requires level 55 runecrafting) instead of the 7 which I would have gotten with a +8 (level 68, 7 airs per essence requires level 66). Obviously, something is wrong with this information. I'm thinking that the robes do not affect multiple runes per essence at all, but I can't confirm this yet. EDIT: I just tested it again with 63 runecrafting as my base, but it still gave me 6x airs. This confirms that the runecrafter robes do not let you craft more runes per essence than you normally would.