I agree with alice_k on this one... It took me a while before I found out how to reply without quoting somebody.
More people definitely means more activity on the site though. I think this place is destined for failure to be honest... There's not much to do here.
Things that are fun: playing Yu-Gi-Oh, watching movies, listening to music, chatting on facebook, chilling out in front of my flat-screen TV, hanging with my girlfriend, etc.
This site offers none of that and never will. It does (in theory) provide a gathering of duelists and promotes bonds of lasting friendship and lifelong dueling. It would be fantastic if it worked that well. However, it does not. Even I find dueling (and talking on here) to be time-consuming, and I don't have much time these days. I have not dueled in ages. I have not been on here in ages either. I'd rather do anything else than come here. This is last on my list of priorities.
Things to improve are the number of fun things to do and the number of people involved in them.