Since they're alot of threads like this, why not merge or request a invitation to GMail? Like, if one user ask a certain type of invitation and leaves his email, why not send him the thing and tell that you send him the invitation? It seems alot easier than giving a invitation for points or a certain item. If anyone needs one, request it here. I'll give it free of charge, or another user will give it to you if she/he wants to.