"The following accounts tried to pre-buy" sounds like everyone in your list was trying to exploit the system.
I can at least tell you that I did try to purchase on the normal site. As soon as the countdown was over I refreshed and tried to buy 10 packs - the first time I got an error message, so I tried again until I got the packs I wanted. I believe that is probably what happened to the others too.
RE: Tower Defense Presale Data Review - Automated purchasing is scary.