It's not e-mail address, it's not name, it's not CC info...

It's your IP.

I've said it a million times. With both me and Suvega BOTH 5-boxing (10 accounts) we've found that creating too many trial accts from the same IP within a short time period prevents you from making any new ones. We had the same issue when we had friends over for a mini-LAN party.

It's intended to be an anti-goldspammer bot thing. Typically the only people making massive amounts of trial accounts are gold spammers or botters.

If you create the trial account from your work computer, or the library, or your neighbor's unprotected wireless (hehe) you should be able to create as many as you like as long as you can find enough unique IP's.

However, I highly recommend using the "refer-a-friend" system to get yourself some free months for those trial accounts.