First of all Marlon Brando is a legend and having him in MJ's video may not have meant a lot to the younger generation, but to those of us who are old enough to remember, seeing Brando with MJ was priceless. So I don't think MJ had a problem with paying him.
MJ has few friends, which is sad considering he is one of the most loved and most famous person in modern history. Miko, Marlon, Dame Elizabeth and maybe a couple of others whose names we don't know becuase they arent' famous, are true friends. Miko never said MJ had a drug problem. Miko defended MJ every step of the way and he has been there for MJ for many years.
If MJ asked Miko to stay on the island Miko would say yes. Maybe he's there, we'll never know, but I do know that Miko is his friend.