Anyone's allowed to participate. Essentially, as many people can join the world creation phase as they please. However, if I think someone writes up something poorly, I'll just refuse their work.

So yeah: join on up! I'll be making the OOC on Monday or Tuesday.

If at any point someone writes something I think is below the level of quality I'm looking for, I'll just tell them so. I don't make any judgements based on how many posts someone has or the like, though, only on what they bring to the thread once it starts.