This system came later into Runscape after the 718 revision shortly before eoc, with "encounters". Players can choose to either join a raiding party or solo-kill. It is a good system and easy to implant/rip.
it ruins economics, buying donator rank with in-game currency? it becomes trad-able, and a value will be set. becoming a P2W server.. +1 for creative thinking, at the end its the community's decision.
congratulations on your promotion.