I voted yes.
As a guest I get to read what is written.
As a member I get to contribute to the discourse
As a subscriber I get to participate in the exchanges, post images, use the chat, etc etc...
As a moderator I get to rifle through all of your PM's and mess with your profile.
It seems fair and appropriate. If you don't pay you can't play (if you don't pay sean and family will be out on the street).
kidding about the moderator bit.