I understand AFK farming. It is useful for servers without economies. In a server with an economy and a large amount of players on it and wanting to play you have to understand the server doesn't want to ruin the experience for other people.
I afk every so often, but if you go over 30 minutes, you really aren't playing Minecraft. If you enjoy being afk while a game in the background hogs resources and gives you virtual money, play cookie clicker.
