In theory, yes, but in practice there seems to be a lot of ungrateful and selfish peeps out there. My guess is that some of them have either sent their invites to mates outside of the thread, or they plain and simple just haven't bothered using their invites at all.
I'm not buying into the excuse of people not being able to find their invites either, ffs there's a link to what they need to know in your op, it's hardly rocket science. I'm sure they'd soon suss it out if there was something in it for them. If someone is good enough to send you an invite then it's only right to do as they have done and use atleast one of your invites on the next guy on the list.
Kreeeee couldn't of hit the nail on the head any harder when he pointed out that everyone posting here should easily get an invite, it's just a shame that is not how it's panned out. Sorry for the semi rant but it just riles me how slow this thread has progressed due to selfish peeps.