Define "successful". Many of them are only interested in floating as long as possible. User donations pay for the server and users have motivation to help keep

Define "successful". Many of them are only interested in floating as long as possible. User donations pay for the server and users have motivation to help keep the site running to keep the ability to pirate. Development and moderation is volunteer work. For many of these sites just their continued existence is a success - however many years it ends up being.