Look christmas,thanksgiving,halloween and easter are easy you can do them in like an hour,you get over fog quickly and any high level will get pretty bored quickly so if they made a good quest that takes ages for f2p then they would get more players that dont want to pay for membership. Because even if they arent paying jagex still get more money from advertising companies who want to advertise based on the amount of runescape players which most of these are f2p. O:) O:)