I'm a big Raymond E. Feist fan.
But I'll never play in a game world where RL cash is the most powerful thing you have. People that developed pay-for-advantage systems should be drug out into the street and shot. Nothing violates the core premise of gaming more than buying your way through the experience.
I get somewhat annoyed that people can pay for stuff, too. But you must realise that unlike a lot of MUDs, Midkemia Online is made and run by professionals rather than amateurs.
Also, there is very little direct advantage by paying money. You cannot pay money to go up levels or increase experience, ao people who pay have to put in just as much hard work as anyone else, they will just get some powers sooner.