When you start a club you need to offer advantages. What are the advantages for someone to join this club? will he be able to get coins cheaper? Will his coins be more secure? What?
"Club" is very much said. I don't want this to be a formal club, so there isn't gonna be any benefits, nor would there be any cost associated. You can view this as a group of lobbyists simply expressing they're doing a certain thing to show others that there's a lot of people doing that thing.