It kinda is.. Although this offer is limited to the dates above, the colour change option will be permanently available once unlocked, so zombies, sugar-fiends and those spending time in Burgh de Rott can maintain an appropriately peaky pallor all year round. It was made to be a promo for those who bought membership via cards on Halloween. People have already paid for it, why would Jagex tell everyone that it was for the above dates only and then turn around and say something like "Actually we are making it free now, TROLOLOLOLOLOL!"