Balancing has always been an issue around. That's because there are many regular that just refuse to join axis/allies. I guess it should be common curtosy for regulars and especially members to keep them balanced. As I speak for myself I hate to play in a team that's a lot stronger, so I tend to join the weaker team. As Toni said, it's not about numbers but it's about the players in each team. Some players can make a huge difference to a team.