A few other points:
1. It might be easier to have someone who is willing to send an invite to post, and those that need one send a PM requesting one. This keeps people from posting email addresses on a public forum.
Actually, that will get anyone with an invite's PM box filled very fast I think. Better to continue posting requests without email. Those with invites, PM the requester with an offer, requester PM back with their email, and finally, requester edit or remove request once they receive an invite.
This prevents anyone who has a couople of invites from getting mobbed with requests, keeps people from needing to post their email publicly, and keeps people who do post their email from getting multiple invites when they only need one.
A good sob story or an offer of something to trade is more likely to get a response than a "can I have one too?" request. For instance, I just sent an offer to Droidgurl because she had a good story, and I am about to offer one to xMx reaper xMx because he amused me.....
Alan