I recon Fuzzleman made it because my invisionfree RPG was doing really succesful (It still is) but unfortunately, I think my one is succesful because it is not fan-based.
Fan-based, "invisionfree" or "freewebs" etc. things never work
Sorry.
The only decent Oddworld forums I have seen are these ones and Junkie.
Another reason why you won't get many members is because most people aren't oddworld fans they have just "Played a demo of that game about 9 years ago".
And get a skin. I woudl join but I don't really see the point in joining a forum that nobody will ever post on (Unles of course you ask me to join)